Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.253.80-4.15
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
perfect along [010] and [100]
Mohs Hardness
43.5-4
2
10
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Chemical Composition
CaF2
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references