Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
Soluble
Durability
-
-
Specific Gravity
3.00-3.253.30-3.50
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Octahedral, perfect on {111}, parting on {011}
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
45
2
10
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Chemical Composition
CaF2
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references