Tenacity
-
Brittle
Solubility
-
slightly water soluble and in hot hydrochloric acid
Durability
-
-
Specific Gravity
5.05-5.223.00-3.25
1
7.18
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Fracture
Uneven
Subconchoidal, Uneven, ConchoidalWalter Schumann
Cleavage
None
Octahedral, perfect on {111}, parting on {011}
Mohs Hardness
5.5-64
2
10
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Chemical Composition
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
CaF2