Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.34-3.443.35
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None
Mohs Hardness
8-8.55.5
2
10
👆🏻
Chemical Composition
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe) 2Si 2O 6Ulrich Henn and Claudio C.