Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.51-2.535.9-6.3
1
7.18
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Fracture
Conchoidal, Splintery
Conchoidal, Uneven
Cleavage
None
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
54.5-5
2
10
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Chemical Composition
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references