Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.772.55-2.65
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Perfect {10 1 0}
Mohs Hardness
5-65.5-6
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)