Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.79-3.945.00-5.20
1
7.18
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Fracture
Lamellar, Splintery
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
{100} Good, {001} Good, {010} Poor
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
46-6.5
2
10
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Chemical Composition
FeAs
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references