Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.655.00-5.20
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
3,1
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
76-6.5
2
10
👆🏻
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references