Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.252.90-3.10
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Splintery, Granular
Cleavage
Octahedral, perfect on {111}, parting on {011}
None
Mohs Hardness
46-6.5
2
10
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Chemical Composition
CaF2
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references