Tenacity
Brittle
-
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
5.00-5.203.355-3.433
1
7.18
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Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
Indistinct on {001}; partings on {011} and {111}
{???} Good, {???} Good
Mohs Hardness
6-6.5-9999
2
10
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Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)