Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.502.54-2.61
1
7.18
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Fracture
Conchoidal, Fibrous
Uneven
Cleavage
{001} perfect and {100} imperfect
{001} Perfect, {010} Good
Mohs Hardness
6-76
2
10
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Chemical Composition
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)