Tenacity
Brittle
Brittle
Solubility
-
slightly water soluble and in hot hydrochloric acid
Durability
-
-
Specific Gravity
2.773.00-3.25
1
7.18
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Fracture
Uneven
Subconchoidal, Uneven, ConchoidalWalter Schumann
Cleavage
Perfect [001] good [010] poor [110]
Octahedral, perfect on {111}, parting on {011}
Mohs Hardness
6-6.54
2
10
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Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
CaF2