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Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).
The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are
trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals.
However, they show a remarkable variety of habits including acute to obtuse rhombohedra,
tabular forms, prisms, or various scalenohedra. (source: Wikipedia)

Photos by Michael Marcotte

Calcite

calcite - Angel Wing habit

calcite

calcite

blue calcite



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Rocks