This mineral, a natural form of calcium carbonate, is very widespread throughout the Earth, occurring in the form of crystals and druses, as well as composing rocks, for example, marble. Stalactites and stalagmites in karst caves also consist of calcite. Moreover, the bones of the skeleton also contain calcite in significant amounts — as well as shellfish shells: this is the most common biomineral. Calcite often replaces organic residues, turning them over time into fossils, paleontological objects — the same mollusk shells or corals.
The name "calcite" comes from the Latin word calx - "calcareous", which reflects the importance of this mineral in industry, as it is used for the production of cement and fertilizers.
Formula: Ca(CO3)
Dimensions: 80*70*50 mm
Origin: Bulgaria, Madan
Hardness: 3
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