Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.772.60-2.64
1
7.18
👆🏻
Fracture
-
Uneven, Splintery, Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Absent
Mohs Hardness
5-66.5-7
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
SiO 2Arthur Thomas , Gemstones (2009)