Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.95-3.075.00-5.20
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
5-66-6.5
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references