Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.252.77
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
Perfect [001] good [010] poor [110]
Mohs Hardness
46-6.5
2
10
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Chemical Composition
CaF2
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)