Tenacity
-
Brittle
Solubility
insoluble in water
Soluble
Durability
-
-
Specific Gravity
2.51-2.633.25-3.35
1
7.18
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Fracture
Fibrous
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect basal
Perfect in three directions
Mohs Hardness
2.5-4.55
2
10
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Chemical Composition
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references