Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.706.86-7.03
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect on {100}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
4.56-7
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references