M MineralystRock & Mineral Guide
Rock

Rock Gypsum

Rock Gypsum — reference photo

Rock Gypsum is a rock with the chemical formula CaSO4·2H2O. It has a Mohs hardness of 2 and vitreous to pearly luster.

Rock Gypsum properties

TypeRock
Chemical formulaCaSO4·2H2O
Mohs hardness2
LusterVitreous to pearly
Typical colorsWhite, grey, colorless, yellow, pink
FormationForms from the evaporation of saline waters
Rarity3 / 10

Mohs hardness 2 — very soft

1 · Talc5 · Apatite10 · Diamond
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