Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.90-3.105.00-5.20
1
7.18
👆🏻
Fracture
Splintery, Granular
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6-6.56-6.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references