Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.252.44-2.62
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
Indiscernible
Mohs Hardness
42.5-5.5
2
10
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Chemical Composition
CaF2
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references