Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.252.50
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Octahedral, perfect on {111}, parting on {011}
Distinct on {100} and {110}
Mohs Hardness
45.5-6
2
10
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Chemical Composition
CaF2
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)