Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.32-3.435.00-5.20
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor on {110} and {100} very poor on {001}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6-76-6.5
2
10
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Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references