Tenacity
Brittle
Brittle
Solubility
Soluble
insoluble in water
Durability
-
-
Specific Gravity
3.10-3.205.00-5.20
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor to good on (001)
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6-6.56-6.5
2
10
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Chemical Composition
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references