Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.02
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
Uneven, Conchoidal
Cleavage
Good on {110}, poor on {100}
{0001} Poor
Mohs Hardness
7.5-9999
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca(Li 2Al)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)