Tenacity
Brittle
-
Solubility
insoluble in water
Soluble
Durability
-
-
Specific Gravity
5.00-5.202.30-2.90
1
7.18
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Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Indistinct on {001}; partings on {011} and {111}
Good to perfect_usually N/A
Mohs Hardness
6-6.55-6
2
10
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Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuAl6(PO4)4(OH)8 • 4H2O