Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.0-3.15.00-5.20
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {001}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
3.56-6.5
2
10
👆🏻
Chemical Composition
Ca(Mg,Al)3(Al3Si)O10(OH)2
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references