Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.59-2.60
1
7.18
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Fracture
Conchoidal
-
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
{001} Perfect, {110} Distinct, {101} Distinct
Mohs Hardness
46-7
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)