Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3-3.155.9-6.3
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
Good on [110] and on [001]
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
6.0-6.54.5-5
2
10
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Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references