Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.603.90-4.00
1
7.18
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Fracture
-
Conchoidal
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
6-73-3.5
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references