Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.0-3.56.86-7.03
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
5-66-7
2
10
👆🏻
Chemical Composition
Na(CaNa)(Mg,Fe++)5(Si8O22)(OH)2
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references