Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.34-3.443.83-3.89
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {01 1 1}
Mohs Hardness
8-8.53.5-4.5
2
10
👆🏻
Chemical Composition
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references