Gypsum Mineral | Uses and Properties

Gypsum Mineral | Uses and Properties
July 15, 2019 admin


An important construction material that has been used for thousands of years

แร่ยิปซัมชนิด Selenite


แร่ยิปซัมชนิด Alabaster


แร่ยิปซัมชนิด Satin Spar

 Satin Spar

What is Gypsum?

Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association withhalite, anhydrite, sulfur, calcite, and dolomite. Gypsum (CaSO4.2H2O) is very similar to Anhydrite (CaSO4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate mineral.

Uses of Gypsum

Gypsum uses include: manufacture of wallboard, cement, plaster of Paris, soil conditioning, a hardening retarder in portland cement. Varieties of gypsum known as “satin spar” and “alabaster” are used for a variety of ornamental purposes; however, their low hardnesslimits their durability.

Physical Properties of Gypsum

Chemical Classification Sulfate
Color Clear, colorless, white, gray, yellow, red, brown
Streak White
Luster Vitreous, silky, sugary
Diaphaneity Transparent to translucent
Cleavage Perfect
Mohs Hardness 2
Specific Gravity 2.3
Diagnostic Properties Cleavage, specific gravity, low hardness
Chemical Composition Hydrous calcium sulfate, CaSO4.2H2O
Crystal System Monoclinic
Uses Used to manufacture dry wall, plaster, joint compound. An agricultural soil treatment.

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