Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.023.25-3.35
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{0001} Poor
Perfect in three directions
Mohs Hardness
-99995
2
10
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Chemical Composition
Ca(Li 2Al)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references