Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.253.20-3.25
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Octahedral, perfect on {111}, parting on {011}
Good/distinct on [210]
Mohs Hardness
45.5
2
10
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Chemical Composition
CaF2
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references