Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.85-6.152.59-2.60
1
7.18
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Fracture
Conchoidal
-
Cleavage
Fair in four directions forming octahedrons
{001} Perfect, {110} Distinct, {101} Distinct
Mohs Hardness
3.5-46-7
2
10
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Chemical Composition
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)