Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
Soluble
Durability
-
-
Specific Gravity
3.00-3.254.1-4.3
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
Indistinct on {011}
Mohs Hardness
43.5-4
2
10
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Chemical Composition
CaF2
CuFeS 2Anthony et al , Handbook of mineralogy (2001)