Gypsum

CaSO4 · 2H2O

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Gypsum is a very soft mineral, the reference for hardness 2 on the Mohs scale. Its varieties include selenite (colorless transparent crystals), satin spar (fibrous), and alabaster (fine-grained massive). It is one of the most widely used industrial minerals.

Crystal System Monoclinic
Mineral Class 07 Sulfates, Chromates, Molybdates, and Tungstates
Mohs Hardness 1.5-2.0
Specific Gravity 2.31-2.33
Color Colorless, white, gray, yellow, brown
Luster Vitreous
Streak White
Cleavage Perfect {010}
Fracture Conchoidal
Transparency Transparent
Crystal Habit Tabular, prismatic, massive

Mohs Hardness

Mohs Hardness: 1.5 – 2.0
1 Soft10 Hard

Crystal System

Monoclinic

Frequently Asked Questions

What is the hardness of Gypsum?
Gypsum has a Mohs hardness of 1.5-2.0.
What crystal system does Gypsum belong to?
Gypsum crystallizes in the Monoclinic crystal system.
What color is Gypsum?
Gypsum is typically Colorless, white, gray, yellow, brown.
What type of luster does Gypsum have?
Gypsum exhibits a Vitreous luster.
What is the chemical formula of Gypsum?
The chemical formula of Gypsum is CaSO4 · 2H2O.