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β§ Gypsum β§
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4Β·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk. The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison. Other forms of gypsum inclu...
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https://en.wikipedia.org/wiki/Gypsum



