Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.32-3.433.70-3.90
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {110} and {100} very poor on {001}
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
6-73.5-4
2
10
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Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references