Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.55-2.705.00-5.20
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6.5-76-6.5
2
10
👆🏻
Chemical Composition
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references