Physical Properties
Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.143.19-3.23
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
Imperfect; basal
{110} good
Mohs Hardness
7.5-85-6
2
10
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Chemical Composition
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)