Tenacity
Brittle
-
Solubility
insoluble
insoluble in water
Durability
-
-
Specific Gravity
6.86-7.033.62-3.87
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal, Irregular
Conchoidal
Cleavage
{100} imperfect, {110} indistinct; partings on {111} or {011}
None
Mohs Hardness
6-77-7.5
2
10
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Chemical Composition
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)