Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.503.43-3.44
1
7.18
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Fracture
Conchoidal, Fibrous
-
Cleavage
{001} perfect and {100} imperfect
None Observed
Mohs Hardness
6-76.5-7
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
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references