Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.253.60-3.61
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Octahedral, perfect on {111}, parting on {011}
Imperfect/fair/absent
Mohs Hardness
48-8.5
2
10
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Chemical Composition
CaF2
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references