Tenacity
Brittle
Brittle
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
5.00-5.202.50
1
7.18
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Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Indistinct on {001}; partings on {011} and {111}
Distinct on {100} and {110}
Mohs Hardness
6-6.55.5-6
2
10
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Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)