Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.25-3.505.00-5.20
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
-99996-6.5
2
10
👆🏻
Chemical Composition
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references