what is gypsum?explain
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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO. 4· 2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.
Mohs scale hardness: 1.5–2 (defining mineral for 2)
Satin spar: Pearly, fibrous masses
Alabaster: Fine-grained, slightly colored
Category: Sulfate minerals
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a metal
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