Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.145.9-6.3
1
7.18
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Fracture
Conchoidal, Uneven
Conchoidal, Uneven
Cleavage
Imperfect; basal
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
7.5-84.5-5
2
10
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Chemical Composition
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references