Tenacity
Brittle
Brittle
Solubility
Slowly dissolves in water
insoluble
Durability
-
-
Specific Gravity
-99996.86-7.03
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
None
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
3.5-46-7
2
10
👆🏻
Chemical Composition
K2Mg2(SO4)3
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references