Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.644.76-5.03
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal
Cleavage
Absent
None
Mohs Hardness
6.5-75.5-6.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)