Tenacity
Brittle
Brittle
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
5.00-5.202.20-2.26
1
7.18
👆🏻
Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
Indistinct on {001}; partings on {011} and {111}
Perfect on {110}
Mohs Hardness
6-6.55-5.5
2
10
👆🏻
Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references