Tenacity
Brittle
Brittle
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.253.70-4.10
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Octahedral, perfect on {111}, parting on {011}
none
Mohs Hardness
46.5-7
2
10
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Chemical Composition
CaF2
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)