Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.74-2.765.00-5.20
1
7.18
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Fracture
Uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
{010} Perfect, {001} Distinct
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
3.5-46-6.5
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references