Tenacity
Brittle
Brittle
Solubility
insoluble in water
Soluble
Durability
-
-
Specific Gravity
5.00-5.202.95-2.96
1
7.18
👆🏻
Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Indistinct on {001}; partings on {011} and {111}
None
Mohs Hardness
6-6.57-7.5
2
10
👆🏻
Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references