Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.603.85-3.94
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
{010} Good, {100} Distinct
Mohs Hardness
6-75-5.5
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)