Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.252.58-2.64
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
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Cleavage
Octahedral, perfect on {111}, parting on {011}
-
Mohs Hardness
47
2
10
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Chemical Composition
CaF2
SiO 2Walter Schumann , Gemstones of the world (2001)