Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.40-2.425.85-6.15
1
7.18
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Fracture
-
Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Fair in four directions forming octahedrons
Mohs Hardness
4.53.5-4
2
10
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Chemical Composition
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references