Physical Properties
Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.903.05-3.21
1
7.18
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Fracture
Conchoidal
Uneven, Subconchoidal, Splintery
Cleavage
Indistinct
Good on {110}, poor on {100}
Mohs Hardness
7.5-87.5
2
10
👆🏻
Chemical Composition
Be 3Al 2Si 6O 18Ulrich Henn and Claudio C.
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references