Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.605.85-6.15
1
7.18
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Fracture
-
Conchoidal
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Fair in four directions forming octahedrons
Mohs Hardness
6-73.5-4
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references