Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.506.50-7.00
1
7.18
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Fracture
Conchoidal, Fibrous
Irregular, Conchoidal
Cleavage
{001} perfect and {100} imperfect
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
6-73
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
PbMoO 4Walter Schumann , Gemstones of the world (2001)