Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.143.87-4.14
1
7.18
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Fracture
Conchoidal, Uneven
Subconchoidal, Conchoidal
Cleavage
Imperfect; basal
Poor on {120}, in traces on {001}
Mohs Hardness
7.5-85.5-6
2
10
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Chemical Composition
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references