Tenacity
Brittle
Flexible
Solubility
Easily soluble in cold dilute HCl
Soluble
Durability
-
-
Specific Gravity
4.122.20-2.40
1
7.18
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Fracture
Uneven
Conchoidal, Splintery, Fibrous
Cleavage
Good in two directions parallel to the prism faces {110}
Perfect on {010}, distinct on {100}
Mohs Hardness
4-4.52
2
10
👆🏻
Chemical Composition
CaZn(AsO4)(OH)
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)