Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.653.25-3.50
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal, Fibrous
Cleavage
3,1
{001} perfect and {100} imperfect
Mohs Hardness
76-7
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references