Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.65-2.902.72-2.75
1
7.18
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Fracture
-
Uneven
Cleavage
{001} Perfect
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
-99996-6.5
2
10
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Chemical Composition
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)