M MineralystRock & Mineral Guide
Mineral

Calcite

Calcite — reference photo

Calcite is a mineral with the chemical formula CaCO3. It has a Mohs hardness of 3 and vitreous to pearly luster.

Calcite properties

TypeMineral
Chemical formulaCaCO3
Mohs hardness3
LusterVitreous to pearly
Typical colorsColorless, white, yellow, blue, green, pink, gray, and many others
FormationFormed through a variety of geological processes, including sedimentary processes, hydrothermal environments, and biological activity
Rarity3 / 10

Mohs hardness 3 — soft

1 · Talc5 · Apatite10 · Diamond
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