Tenacity
-
Brittle
Solubility
insoluble in water
insoluble
Durability
-
-
Specific Gravity
3.62-3.876.86-7.03
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
None
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
7-7.56-7
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references