Tenacity
Brittle
-
Solubility
slightly water soluble and in hot hydrochloric acid
-
Durability
-
-
Specific Gravity
3.00-3.253.31
1
7.18
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Fracture
Subconchoidal, Uneven, ConchoidalWalter Schumann
-
Cleavage
Octahedral, perfect on {111}, parting on {011}
Indiscernible
Mohs Hardness
4-9999
2
10
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Chemical Composition
CaF2
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)