Tenacity
-
Brittle
Solubility
Soluble
insoluble in water
Durability
-
-
Specific Gravity
1.847-1.8525.00-5.20
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor to indistinct on {010}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
2-36-6.5
2
10
👆🏻
Chemical Composition
Ca3Al3(SiO4)3(OH)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references