Tenacity
Brittle
-
Solubility
Easily soluble in cold dilute HCl
-
Durability
-
-
Specific Gravity
4.122.24-2.29
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Conchoidal
Cleavage
Good in two directions parallel to the prism faces {110}
Very poor [100]
Mohs Hardness
4-4.55-5.5
2
10
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Chemical Composition
CaZn(AsO4)(OH)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references