Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.34-3.444.95-5.0
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
8-8.54-5
2
10
👆🏻
Chemical Composition
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references