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Calcite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. 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 double refraction in ...
Calcite, the most common form of natural calcium carbonate (CaCO 3), a widely distributed mineral known for the beautiful development and great variety of its crystals. It is polymorphous (same chemical formula but different crystal structure) with the minerals aragonite and vaterite and with several forms that apparently exist only under rather extreme experimental conditions.
Calcite is often the only mineral present, but in some sedimentary environments, calcite may be associated with dolomite, gypsum, anhydrite, chert, or halite. In hydrothermal veins, quartz and other common vein minerals such as pyrite, dolomite, fluorite, galena, and chalcopyrite may occur with calcite (Kauwenbergh, 2010) .
Calcite is the principal mineral of the rock group known as carbonates. Calcite is a major component in limestone and dolomite. Uses. Calcite is the mineral component of limestone which is used primarily as construction aggregates, and in production of lime and cement.
Calcite Group. Calcite-Rhodochrosite Series. A very common and widespread mineral with highly variable forms and colours. Calcite is best recognized by its relatively low Mohs hardness (3) and its high reactivity with even weak acids, such as vinegar, plus its prominent rhombohedral cleavage in most varieties.
Calcite. specimen number: 3651351. location: Magma mine, Superior, Pinal Co., Arizona, USA. description: Colorless to slightly pinkish scalenohedral crystals of calcite to 1.3 cm in size across the top of this matrix. In good condition with very slight micro-cleaving present. Fluorescent. Watch Specimen Video. Size: 12.5 x 7.5 x 5.5 cm (cabinet)
Calcite. specimen number: 3651210. location: Thomasville quarry, York Co., Pennsylvania, USA. description: Attractive yellow glassy gemmy twinned calcite crystal on a small amount of matrix. In very good condition all around as seen. Watch Specimen Video. Size: 6.5 x 4.5 x 3.5 cm (small-cabinet) Collection: Bob Pam Stewart
Carbonate minerals and their relative stability. Calcite, crystallizing in the rhombohedral crystal system is the thermodynamically stable phase of calcium carbonate. Aragonite, calcite's orthorhombic polymorph, is about 1.5 times more soluble than calcite. Magnesian calcite is an important sub-group of carbonates that occurs as skeletal ...
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