Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.7-3.83.25-3.35
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct on {010}
Perfect in three directions
Mohs Hardness
7-7.55
2
10
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Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references