Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.32-3.43
1
7.18
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Fracture
Uneven, Subconchoidal, Splintery
Conchoidal
Cleavage
Good on {110}, poor on {100}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
7.56-7
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4