Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.34-3.44-9999
1
7.18
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Fracture
Conchoidal
-
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
-
Mohs Hardness
8-8.5-9999
2
10
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Chemical Composition
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO2, Al2O3, CaO, MgO, FeO