Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.502.9
1
7.18
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Fracture
Conchoidal, Fibrous
Conchoidal
Cleavage
{001} perfect and {100} imperfect
{???} Indistinct
Mohs Hardness
6-74.5
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
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)