Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.603.43-3.44
1
7.18
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Fracture
-
-
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
None Observed
Mohs Hardness
6-76.5-7
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references