Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.143.19-3.56
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, Conchoidal
Cleavage
Imperfect; basal
{110} Perfect, {010} Indistinct
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.
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)