Tenacity
Brittle
-
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
5.00-5.202.60-3.02
1
7.18
👆🏻
Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
-
Cleavage
Indistinct on {001}; partings on {011} and {111}
Perfect
Mohs Hardness
6-6.5-9999
2
10
👆🏻
Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)