Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.776.30-6.39
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
[001] good, [210] distinct
Mohs Hardness
5-63-3.5
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references