Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.776.50-7.00
1
7.18
👆🏻
Fracture
-
Irregular, Conchoidal
Cleavage
{110} Perfect, {110} Perfect
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
5-63
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
PbMoO 4Walter Schumann , Gemstones of the world (2001)