Tenacity
Flexible
Brittle
Solubility
Soluble
Easily soluble in cold dilute HCl
Durability
-
-
Specific Gravity
2.20-2.404.12
1
7.18
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Fracture
Conchoidal, Splintery, Fibrous
Uneven
Cleavage
Perfect on {010}, distinct on {100}
Good in two directions parallel to the prism faces {110}
Mohs Hardness
24-4.5
2
10
👆🏻
Chemical Composition
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
CaZn(AsO4)(OH)