Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.32-3.435.50-5.90
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {110} and {100} very poor on {001}
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
6-74
2
10
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Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)