Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.82-4.006.86-7.03
1
7.18
👆🏻
Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
{???} Indistinct
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
5.56-7
2
10
👆🏻
Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references