Question

What is gypsum???????​

Answer 1

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO₄·2H₂O. 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. Wikipedia

Optical properties: Biaxial (+)

Crystal class: Prismatic (2/m); H-M symbol: (2/m)

Crystal system: Monoclinic

Crystal habit: Massive, flat. Elongated and generally prismatic crystals

Solubility: Hot, dilute HCl

Alabaster: Fine-grained, slightly colored

Mohs scale hardness: 1.5–2 (defining mineral for 2)

Answer 2

Answer:

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