Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.80-4.152.90-3.40
1
7.18
👆🏻
Fracture
Uneven
Uneven, ConchoidalWalter Schumann
Cleavage
perfect along [010] and [100]
Indiscernible
Mohs Hardness
3.5-47-7.5
2
10
👆🏻
Chemical Composition
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.