Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.022.90-2.98
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{0001} Poor
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
-99997.5-8
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)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references