Tenacity
-
Brittle
Solubility
insoluble in water
insoluble in water
Durability
-
-
Specific Gravity
2.51-2.635.00-5.20
1
7.18
👆🏻
Fracture
Fibrous
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect basal
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
2.5-4.56-6.5
2
10
👆🏻
Chemical Composition
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references