Tenacity
Brittle
Brittle
Solubility
Easily soluble in cold dilute HCl
-
Durability
-
-
Specific Gravity
4.122.72-2.75
1
7.18
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Fracture
Uneven
Uneven
Cleavage
Good in two directions parallel to the prism faces {110}
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
4-4.56-6.5
2
10
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Chemical Composition
CaZn(AsO4)(OH)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)