Tenacity
-
-
Solubility
-
Insoluble in acids
Durability
-
-
Specific Gravity
1.65-1.994.20-4.30
1
7.18
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Fracture
Uneven
Uneven, Conchoidal
Cleavage
{010} Perfect, {110} Perfect
{110} good, 100 moderate, parting on {092} and {011}
Mohs Hardness
2-2.56-6.5
2
10
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Chemical Composition
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)