Tenacity
Brittle
-
Solubility
Easily soluble in cold dilute HCl
-
Durability
-
-
Specific Gravity
4.123.1-3.2
1
7.18
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Fracture
Uneven
-
Cleavage
Good in two directions parallel to the prism faces {110}
Vitreous, pearly on cleavage
Mohs Hardness
4-4.53-4
2
10
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Chemical Composition
CaZn(AsO4)(OH)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references