Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.502.65
1
7.18
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Fracture
Conchoidal, Fibrous
Conchoidal, ConchoidalWalter Schumann
Cleavage
{001} perfect and {100} imperfect
3,1
Mohs Hardness
6-77
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
SiO 2Ulrich Henn and Claudio C.