Calcite, a carbonate mineral, is the most stable polymorph of calcium carbonate; the other pump minerals (minerals with a chemical composition, allowing it to crystallize in several forms) are Vaterite and Aragonite. The latter transforms to calcite at 380–470 °C, while Vaterite is still less stable. Calcite is the main component of marble and limestone. These are extremely common rocks that constitute a considerable part of Earth’s crust. These are among the largest deposits of carbon on the surface of earth.
Derivation of Name
The mineral Calcite, inherits its name from "chalix, " the Greek word meaning lime, which is the most amazing and still the most widespread mineral.
Calcite forms a regular ingredient of sedimentary rocks, especially limestone, much of which gets created from the shells of dead marine organisms. About ten percent of sedimentary rock is in the form of limestone. Calcite crystals are trigonal-rhombohedral. However, actual calcite rhombohedra are atypical as natural crystals. Yet, they demonstrate a noteworthy assortment of characteristics, including acute to obtuse rhombohedra, prisms, tabular forms or various scalenohedra (Wikipedia describes Scalenohedra as a solid figure with typically more than six plane phases containing three or more pairs of mutually congruent scalene triangles with each side of the triangle having different lengths), as faces.
Calcite demonstrates many types of twinning, totaling to the range of practical forms. It may be found as granular, lamellar, fibrous or compact. Cleavage is typically in three directions parallel to the rhombohedron form. Its fissure is conchoidal.
The mineral Calcite is considered a gemstone that is in use; it is an efficient cleanser and amplifier for different kinds of energies. Calcite is a transparent crystal available in clear colors of pink, green, blue and orange. All Calcites exude energy channels and radiate mild energy for revitalizing and cleansing purposes.
The prominent places where calcite occurs are Ohio, Pugh Quarry; Illinois, Rosiclare; New Jersey, Franklin; Brush Creek; Tennessee, Elmwood and several other localities, like Wisconsin, Missouri, Kansas and Oklahoma,in the USA; Harz Mountains, Andrea burg and Saxony, Germany; México, Guanajuato; Brazil; Durham and Lancashire, Cornwall, England; Bombay in India; Eskifjord in Iceland; several localities of Africa and many other countries in the world.
Calcite is indeed among the collectible minerals. You get it in numerous attractive forms and varieties that are worthy of collection. Generally, it is conveniently identified due its rhomohedral cleavage, double refraction, reaction to acids, and is an excellent classroom specimen of these properties. Its varying forms, colors and background, make is almost impossible for a collector to procure all its likely combinations.
Color is awfully uneven, but usually white or colorless or with slight shades of yellow, gray, blue, pink, orange, red, green, brown, and black, and they are rarely iridescent.
Calcite mineral uses are many as it finds wide use in abrasives, soil treatment, pharmaceuticals and in the construction industry.
Mohs Scale hardness