Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.77-2.883.25-3.35
1
7.18
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Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect basal
Perfect in three directions
Mohs Hardness
2.55
2
10
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Chemical Composition
K(Al,Cr) 3Si 3O 10(OH) 2Gemdat.org , Management Team (2012)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references