Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.253.26-3.36
1
7.18
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Fracture
-
Conchoidal
Cleavage
Imperfect in one direction
Good on {100}
Mohs Hardness
5-5.56.5-7
2
10
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Chemical Composition
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references