Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.752.65-2.90
1
7.18
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Fracture
Uneven
-
Cleavage
Perfect on [001], good on [010], imperfect on [110]
{001} Perfect
Mohs Hardness
6-6.5-9999
2
10
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Chemical Composition
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references