Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.703.05-3.21
1
7.18
👆🏻
Fracture
-
Uneven, Subconchoidal, Splintery
Cleavage
None
Good on {110}, poor on {100}
Mohs Hardness
6.5-77.5
2
10
👆🏻
Chemical Composition
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references