Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
Soluble
Durability
-
-
Specific Gravity
3.00-3.253.25-3.35
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Conchoidal, ConchoidalWalter Schumann
Cleavage
Octahedral, perfect on {111}, parting on {011}
Perfect in three directions
Mohs Hardness
45
2
10
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Chemical Composition
CaF2
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references