Calcite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. Agate (/ . t /) is a common rock formation, consisting of chalcedony and quartz as its primary components, with a wide variety of colors. Example: Good crystals of celestite. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3.It has the same crystal structure as corundum (Al 2 O 3) and ilmenite (FeTiO 3).With this it forms The concepts of twinning shears and twinning modes are introduced. The Hocking Glass Company was established in 1905 and by the 1930s, it had become one of the most well-known glassware manufacturers in the United States. This is followed by a detailed discussion of the formal theories of Bilby and Crocker and Bevis and Crocker for predicting these elements. Such minerals either contain the atoms of only one element or else are metal alloys. They may show good cleavage or crystal faces. The scale arranges the minerals in order of increasing hardness. Learning to recognize cleavage is an especially important and useful skill in studying minerals. Crystallography: Quartz rhombohedral; trigonal-trapezohedral.Quartz hexagonal; trapezohedral. The Six entropy diagrams for parahydrogen in or near the saturated liquid state cover the temperature range from 29.16 degrees to 42.48 degrees R with pressures to 100 psia and Cleavage, in mineralogy and materials science, is the tendency of crystalline materials to split along definite crystallographic structural planes. Minerals are naturally occurring, inorganic, solids with a specific chemical formula and atomic arrangement. Example: Good crystals of celestite. They are similar in many physical properties, and may partially or fully replace one another, forming a solid solution series.All members of the calcite group crystallize in the trigonal system, have perfect rhombohedral cleavage, and exhibit strong Hardness is determined by the ability of one mineral to scratch another. This is followed by a detailed discussion of the formal theories of Bilby and Crocker and Bevis and Crocker for predicting these elements. This photo shows a bunch of calcite cleavage fragments. Hardness = 3.0; cleavage = rhombohedral; fracture = conchoidal; luster = vitreous or pearly; effervescence = strong; streak = white. PROP.(Enc. Shining Image is produced by reflection but it is rather indistinct. Example: Chalcopyrites. Rare. Corundum has two primary gem varieties: ruby and sapphire. PROP.(Enc. They have a specific, predictable chemical composition. Crystal systems that have space groups assigned to a common lattice 3.68 Calcite showing rhombohedral cleavage. Learning to recognize cleavage is an especially important and useful skill in studying minerals. This page features an alphabetical list of minerals. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3).It is a very common mineral, particularly as a component of limestone.Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has This page features an alphabetical list of minerals. Calcite has a hardness of 3, while dolomite is slightly harder at 3 1/2 to 4. This page features an alphabetical list of minerals. The scale arranges the minerals in order of increasing hardness. Click on image to see enlarged photo. Example: Good crystals of celestite. The early attempts to predict these features are presented. These materials include many anisotropic natural and synthetic crystals, minerals, and chemicals. of Minerals,2nd ed.,1990) OPTIC PROP. These planes of relative weakness are a result of the regular locations of atoms and ions in the crystal, which create smooth repeating surfaces that are visible both in the microscope and to the naked eye. Which one of the following is NOT true for minerals? Agate (/ . t /) is a common rock formation, consisting of chalcedony and quartz as its primary components, with a wide variety of colors. They are similar in many physical properties, and may partially or fully replace one another, forming a solid solution series.All members of the calcite group crystallize in the trigonal system, have perfect rhombohedral cleavage, and exhibit strong Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate dates back to Ancient Greece in assorted jewelry and in the seal stones of Greek warriors. Much like cubic cleavage, minerals like calcite that have rhombohedral cleavage can break into smaller rhombohedron crystals, which, as the name suggests, look like a rhombus. Prismatic, pyramidal, rhombohedral, and scalenohedral crystals , also massive, usually as complex intergrown crystal aggregates: 5.58 (pyrargyrite), 5.57 (proustite) Isostructural species difficult to distinguish, though pyrargyrite is usually darker in color and more common than proustite, fusible in a candle flame. Compare the shape of these fragments with the clear calcite shown in Figure 3.38. These pages assume you understand such properties as cleavage, fracture, streak, luster, hardness, etc. Calcite. Rhombohedral also known as trigonal. Soy protein is a protein that is isolated from soybean.It is made from soybean meal that has been dehulled and defatted.Dehulled and defatted soybeans are processed into three kinds of high protein commercial products: soy flour, concentrates, and isolates.Soy protein isolate has been used since 1959 in foods for its functional properties. Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium and chromium. A lattice system is a set of Bravais lattices. Perfect basal cleavage, malleable, deformed rather than breaking away Rhombohedral: Pale brass or bronze yellow/greenish black: Metallic: 3.03.5: Minerals which are part of the cubic system and amorphous solid are isotropic which means that light behaves the same way no matter which direction it is traveling in the crystal. The Hardness is determined by the ability of one mineral to scratch another. The best way to tell these minerals apart is to consider their hardness and acid reaction. Corundum has two primary gem varieties: ruby and sapphire. Minerals are classified based on characteristics such as hardness and crystal shape (e.g., hexagonal, cubic). All calcite will readily effervesce in dilute hydrochloric acid. These pages assume you understand such properties as cleavage, fracture, streak, luster, hardness, etc. Other rocks can be defined by relative abundances of key (essential) minerals; a granite is defined by proportions of quartz, alkali feldspar, and plagioclase feldspar. Calcite. Steps of cleavage along the same cleavage direction . So calcite cleaves into shapes called rhombs. You determine that this mineral is: gypsum. The stabilization of soil organic matter is crucial for global carbon cycling processes as soil stores large amounts of organic carbon. A nonmetallic mineral that is grey, white, pink, or yellow in color, has 3 perfect cleavage planes that form rhombohedral crystals (crystals may appear bent), effervesces in hydrochloric acid (HCl) when powdered, and has a hardness of 2.5 to 4.0. of Minerals,2nd ed.,1990) OPTIC PROP. They may show good cleavage or crystal faces. similar to tetragonal, two of the axes are the same length and the third is longer. Federick Mohs, a German mineralogist, produced a hardness scale (table 5) using a set of ten standard minerals. Since cleavage directions are always parallel to certain crystal faces in a mineral, these may be described as such. Earth materials are the foundational building blocks of the Geosphere and are generally thought of as the minerals and rock that compose the solid Earth. The rhombohedral cleavage block of calcite produces two images when it is placed over an object, and then viewed with reflected light passing through the crystal. Crystals are often striated. Calcite is typically clear to white to yellow in color and displays a characteristic rhombohedral cleavage. Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts.Specific studies within mineralogy include the processes of mineral origin and formation, classification of minerals, their geographical distribution, as well as their utilization. Perfect basal cleavage, malleable, deformed rather than breaking away Rhombohedral: Pale brass or bronze yellow/greenish black: Metallic: 3.03.5: Minerals which are part of the cubic system and amorphous solid are isotropic which means that light behaves the same way no matter which direction it is traveling in the crystal. A rock is an aggregate of one or more minerals or mineraloids. you find a mineral with rhombohedral cleavage that reacts with hydrochloric acid. These materials include many anisotropic natural and synthetic crystals, minerals, and chemicals. Hematite (/ h i m t a t, h m -/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. The native elements are divided into metallic, semimetallic, and nonmetallic subgroups. (AntBidBlaNic3) See Also: Links to other databases for Ilmenite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Hardness = 3.0; cleavage = rhombohedral; fracture = conchoidal; luster = vitreous or pearly; effervescence = strong; streak = white. Thermodynamic properties of saturated liquid parahydrogen charted for important temperature range. Dendritic and rosette forms are also found. Six entropy diagrams for parahydrogen in or near the saturated liquid state cover the temperature range from 29.16 degrees to 42.48 degrees R with pressures to 100 psia and Minerals may have their normal diagnostic colors: quartz is clear, feldspars are white or pink, muscovite is silvery and sparkly, magnetite appears metallic, and biotite and other mafic minerals appear black. May form as a pseudomorph after other minerals, especially as octahedral crystals of Magnetite. Common table salt is one example of this kind of solid. Which one of the following is NOT true for minerals? Light-feeling minerals have a specific gravity lower than 2.0 Normal-feeling minerals have specific gravities between 2.0 and 4.5 Heavy-feeling minerals have specific gravities higher than 4.5; If you want to be more accurate in your measurements (which I would recommend) you can get a few basic tools to step up your game. The property of cleavage reflects: the luster of the mineral. Perfect basal cleavage, malleable, deformed rather than breaking away Rhombohedral: Pale brass or bronze yellow/greenish black: Metallic: 3.03.5: Minerals which are part of the cubic system and amorphous solid are isotropic which means that light behaves the same way no matter which direction it is traveling in the crystal. The occlusion of SOM within minerals sequesters these organic molecules, rendering them inaccessible to interference from biotic and abiotic factors. Calcite has a hardness of 3, while dolomite is slightly harder at 3 1/2 to 4. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate dates back to Ancient Greece in assorted jewelry and in the seal stones of Greek warriors. Hardness = 3.0; cleavage = rhombohedral; fracture = conchoidal; luster = vitreous or pearly; effervescence = strong; streak = white. Shining Image is produced by reflection but it is rather indistinct. The major steps for Calcite production are as mentioned below: Step 1: Crush the incoming minerals and transfer them to ball mills to convert them to powder form. These pages assume you understand such properties as cleavage, fracture, streak, luster, hardness, etc. Calcite. Like halite, calcite has three good cleavages. The early attempts to predict these features are presented. Use of beads necklaces with pierced and Shining Image is produced by reflection but it is rather indistinct. Calcite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. So calcite cleaves into shapes called rhombs. Glistening There is a general reflection from the surface, but no image is seen. The most common confusion is between the names "rhodochrosite" and "rhodonite" -- both are pink, manganese-rich minerals with very similar names that people have a hard time remembering. Like halite, calcite has three good cleavages. Calcite Production. The most common confusion is between the names "rhodochrosite" and "rhodonite" -- both are pink, manganese-rich minerals with very similar names that people have a hard time remembering. The best way to tell these minerals apart is to consider their hardness and acid reaction. Crystals commonly prismatic, with prism faces horizontally striated. Six entropy diagrams for parahydrogen in or near the saturated liquid state cover the temperature range from 29.16 degrees to 42.48 degrees R with pressures to 100 psia and Each higher-numbered (harder) mineral will scratch any mineral with a lower number (softer). Minerals may have their normal diagnostic colors: quartz is clear, feldspars are white or pink, muscovite is silvery and sparkly, magnetite appears metallic, and biotite and other mafic minerals appear black. Min. Since cleavage directions are always parallel to certain crystal faces in a mineral, these may be described as such. Soy protein is a protein that is isolated from soybean.It is made from soybean meal that has been dehulled and defatted.Dehulled and defatted soybeans are processed into three kinds of high protein commercial products: soy flour, concentrates, and isolates.Soy protein isolate has been used since 1959 in foods for its functional properties. Rhombohedral cleavage fragments are exceptionally common. Use of beads necklaces with pierced and Minerals are naturally occurring, inorganic, solids with a specific chemical formula and atomic arrangement. Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium and chromium. Table IID-2: Nonmetallic Luster; Hardness greater than 3 but less than 5, Cleavage not prominent: (Can not be scratched by White streak; feels greasy. But, unlike halite, the cleavages are not perpendicular to each other. 3.68 Calcite showing rhombohedral cleavage. Minerals are classified based on characteristics such as hardness and crystal shape (e.g., hexagonal, cubic). Terminated usually by a combination of positive and negative rhombohedrons, which often are so equally developed as to give the effect of a hexagonal dipyramid. Calcite Production. Prismatic, pyramidal, rhombohedral, and scalenohedral crystals , also massive, usually as complex intergrown crystal aggregates: 5.58 (pyrargyrite), 5.57 (proustite) Isostructural species difficult to distinguish, though pyrargyrite is usually darker in color and more common than proustite, fusible in a candle flame. These planes of relative weakness are a result of the regular locations of atoms and ions in the crystal, which create smooth repeating surfaces that are visible both in the microscope and to the naked eye. Rhombohedral cleavage fragments are exceptionally common. Its pink color, perfect cleavage in three directions, low hardness, and weak effervescence with cold dilute hydrochloric acid are rarely seen in other minerals. Space groups are classified into crystal systems according to their point groups, and into lattice systems according to their Bravais lattices. Example: Rhombohedral faces of crystallized hematite. A rock is an aggregate of one or more minerals or mineraloids. There is also a page that matches the University of Pittsburgh's recitation rock kits and pages that group the main minerals found in igneous, sedimentary, and metamorphic rocks. similar to tetragonal, two of the axes are the same length and the third is longer. Prismatic, pyramidal, rhombohedral, and scalenohedral crystals , also massive, usually as complex intergrown crystal aggregates: 5.58 (pyrargyrite), 5.57 (proustite) Isostructural species difficult to distinguish, though pyrargyrite is usually darker in color and more common than proustite, fusible in a candle flame. In crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point). hexagonal, tetragonal, rhombohedral, orthorhombic, monoclinic and triclinic. The most common confusion is between the names "rhodochrosite" and "rhodonite" -- both are pink, manganese-rich minerals with very similar names that people have a hard time remembering. This photo shows a bunch of calcite cleavage fragments. Ask about Dolomite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Espaol NAME( Sinkankas66) PHYS. Min. Scalenohedral and rhombohedral crystals occur, as well as tabular and groups of tabular crystals. NASA Technical Reports Server (NTRS) Mc Carty, R. D.; Roder, H. M. 1967-01-01. The major steps for Calcite production are as mentioned below: Step 1: Crush the incoming minerals and transfer them to ball mills to convert them to powder form. Space groups are classified into crystal systems according to their point groups, and into lattice systems according to their Bravais lattices. But, unlike halite, the cleavages are not perpendicular to each other. The property of cleavage reflects: the luster of the mineral. Example: Chalcopyrites. May form as a pseudomorph after other minerals, especially as octahedral crystals of Magnetite. The Terminated usually by a combination of positive and negative rhombohedrons, which often are so equally developed as to give the effect of a hexagonal dipyramid. There is also a page that matches the University of Pittsburgh's recitation rock kits and pages that group the main minerals found in igneous, sedimentary, and metamorphic rocks. Click on image to see enlarged photo. The Hocking Glass Company was established in 1905 and by the 1930s, it had become one of the most well-known glassware manufacturers in the United States. Other rocks can be defined by relative abundances of key (essential) minerals; a granite is defined by proportions of quartz, alkali feldspar, and plagioclase feldspar. Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with the chemical formula Ca(Fe,Mg,Mn)(CO 3) 2.In composition it is closely related to dolomite, but differs from this in having magnesium replaced by varying amounts of iron(II) and manganese.It forms a series with dolomite and kutnohorite.. Such minerals either contain the atoms of only one element or else are metal alloys. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3.It has the same crystal structure as corundum (Al 2 O 3) and ilmenite (FeTiO 3).With this it forms This is followed by a detailed discussion of the formal theories of Bilby and Crocker and Bevis and Crocker for predicting these elements. Hematite (/ h i m t a t, h m -/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. hexagonal, tetragonal, rhombohedral, orthorhombic, monoclinic and triclinic. Cleavage, in mineralogy and materials science, is the tendency of crystalline materials to split along definite crystallographic structural planes. Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with the chemical formula Ca(Fe,Mg,Mn)(CO 3) 2.In composition it is closely related to dolomite, but differs from this in having magnesium replaced by varying amounts of iron(II) and manganese.It forms a series with dolomite and kutnohorite.. Federick Mohs, a German mineralogist, produced a hardness scale (table 5) using a set of ten standard minerals. Vintage Fire-King Pattern Identification. A nonmetallic mineral that is grey, white, pink, or yellow in color, has 3 perfect cleavage planes that form rhombohedral crystals (crystals may appear bent), effervesces in hydrochloric acid (HCl) when powdered, and has a hardness of 2.5 to 4.0. NAME( Sinkankas66) PHYS. Steps of cleavage along the same cleavage direction . So calcite cleaves into shapes called rhombs. Crystallography: Quartz rhombohedral; trigonal-trapezohedral.Quartz hexagonal; trapezohedral. In the past Dendritic and rosette forms are also found. May form as a pseudomorph after other minerals, especially as octahedral crystals of Magnetite. Light-feeling minerals have a specific gravity lower than 2.0 Normal-feeling minerals have specific gravities between 2.0 and 4.5 Heavy-feeling minerals have specific gravities higher than 4.5; If you want to be more accurate in your measurements (which I would recommend) you can get a few basic tools to step up your game. A lattice system is a set of Bravais lattices. Each higher-numbered (harder) mineral will scratch any mineral with a lower number (softer). Crystallography: Quartz rhombohedral; trigonal-trapezohedral.Quartz hexagonal; trapezohedral. You determine that this mineral is: gypsum. Crystal systems that have space groups assigned to a common lattice Calcite Production. In crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point). The important fact is that with 100 tonnes of Example: Rhombohedral faces of crystallized hematite. Minerals are crystalline solids. Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium and chromium. Its pink color, perfect cleavage in three directions, low hardness, and weak effervescence with cold dilute hydrochloric acid are rarely seen in other minerals. However, the microscopic mechanisms of occlusion are lacking. Federick Mohs, a German mineralogist, produced a hardness scale (table 5) using a set of ten standard minerals. Glistening There is a general reflection from the surface, but no image is seen. Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with the chemical formula Ca(Fe,Mg,Mn)(CO 3) 2.In composition it is closely related to dolomite, but differs from this in having magnesium replaced by varying amounts of iron(II) and manganese.It forms a series with dolomite and kutnohorite.. You determine that this mineral is: gypsum. Minerals are crystalline solids. Crystals are often striated. Other rocks can be defined by relative abundances of key (essential) minerals; a granite is defined by proportions of quartz, alkali feldspar, and plagioclase feldspar. Thermodynamic properties of saturated liquid parahydrogen charted for important temperature range. Some rocks, such as limestone or quartzite, are composed primarily of one mineral calcite or aragonite in the case of limestone, and quartz in the latter case. Earth materials are the foundational building blocks of the Geosphere and are generally thought of as the minerals and rock that compose the solid Earth. But, unlike halite, the cleavages are not perpendicular to each other. Hardness is determined by the ability of one mineral to scratch another. These Serpentine minerals are almost impossible to tell apart, particularly in massive forms. Step 3: Split the powder in 3-micron, 5-micron, 10- micron bags as required.. The Hocking Glass Company was established in 1905 and by the 1930s, it had become one of the most well-known glassware manufacturers in the United States. The major steps for Calcite production are as mentioned below: Step 1: Crush the incoming minerals and transfer them to ball mills to convert them to powder form. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3).It is a very common mineral, particularly as a component of limestone.Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has They are similar in many physical properties, and may partially or fully replace one another, forming a solid solution series.All members of the calcite group crystallize in the trigonal system, have perfect rhombohedral cleavage, and exhibit strong Min. These Serpentine minerals are almost impossible to tell apart, particularly in massive forms. Weinrich Minerals, Inc. Google Search for Dolomite. Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts.Specific studies within mineralogy include the processes of mineral origin and formation, classification of minerals, their geographical distribution, as well as their utilization. The occlusion of SOM within minerals sequesters these organic molecules, rendering them inaccessible to interference from biotic and abiotic factors. All calcite will readily effervesce in dilute hydrochloric acid. Agate (/ . t /) is a common rock formation, consisting of chalcedony and quartz as its primary components, with a wide variety of colors. The concepts of twinning shears and twinning modes are introduced. The property of cleavage reflects: the luster of the mineral. It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. For instance, cubic cleavage (galena and haylite), rhombohedral cleavage (calcite) and prismatic cleavage, basal cleavage and octahedral cleavage. Crystals commonly prismatic, with prism faces horizontally striated. The native elements are divided into metallic, semimetallic, and nonmetallic subgroups. NASA Technical Reports Server (NTRS) Mc Carty, R. D.; Roder, H. M. 1967-01-01. Glistening There is a general reflection from the surface, but no image is seen. you find a mineral with rhombohedral cleavage that reacts with hydrochloric acid. Space groups are classified into crystal systems according to their point groups, and into lattice systems according to their Bravais lattices. (CaCO 3) are isostructural and possess the same rhombohedral cleavage. Minerals are crystalline solids. Rhombohedral also known as trigonal. Steps of cleavage along the same cleavage direction . These Serpentine minerals are almost impossible to tell apart, particularly in massive forms. However, the microscopic mechanisms of occlusion are lacking. Terminated usually by a combination of positive and negative rhombohedrons, which often are so equally developed as to give the effect of a hexagonal dipyramid. Ask about Dolomite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Espaol (AntBidBlaNic3) See Also: Links to other databases for Ilmenite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. If bonds in certain directions are There is also a page that matches the University of Pittsburgh's recitation rock kits and pages that group the main minerals found in igneous, sedimentary, and metamorphic rocks. Which one of the following is NOT true for minerals? The early attempts to predict these features are presented. (CaCO 3) are isostructural and possess the same rhombohedral cleavage. It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties: ruby and sapphire. Minerals are naturally occurring, inorganic, solids with a specific chemical formula and atomic arrangement. PROP.(Enc. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate dates back to Ancient Greece in assorted jewelry and in the seal stones of Greek warriors. Calcite is typically clear to white to yellow in color and displays a characteristic rhombohedral cleavage. Calcite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. The stabilization of soil organic matter is crucial for global carbon cycling processes as soil stores large amounts of organic carbon. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3).It is a very common mineral, particularly as a component of limestone.Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has Crystal systems that have space groups assigned to a common lattice Ask about Dolomite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Espaol Harder at 3 1/2 to 4 ruby and sapphire Mohs, a German mineralogist, a Inc. Google Search for dolomite Bevis and Crocker and Bevis and Crocker predicting. They may show good cleavage or crystal faces clear calcite shown in Figure. 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