Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.30-2.506.86-7.03
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect on (001)
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
4.5-56-7
2
10
👆🏻
Chemical Composition
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references