Tenacity
Brittle
Brittle
Solubility
insoluble in water
Soluble
Durability
-
-
Specific Gravity
5.00-5.202.67-2.73
1
7.18
👆🏻
Fracture
Uneven, Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Indistinct on {001}; partings on {011} and {111}
Perfect on [10 1 1] three directions with angle of 74° 55
Mohs Hardness
6-6.53
2
10
👆🏻
Chemical Composition
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaCO 3Ulrich Henn and Claudio C.