Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.50-3.60
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
{110} Perfect, {110} Perfect
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
5-66
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.