Tenacity
Brittle
Brittle
Solubility
-
slightly water soluble and in hot hydrochloric acid
Durability
-
-
Specific Gravity
3.70-4.103.00-3.25
1
7.18
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Fracture
Conchoidal, Uneven
Subconchoidal, Uneven, ConchoidalWalter Schumann
Cleavage
none
Octahedral, perfect on {111}, parting on {011}
Mohs Hardness
6.5-74
2
10
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Chemical Composition
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
CaF2