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Wolframite

Mineral Data
(Fe2+)WO4 to (Mn2+)WO4
Synonym Of: 
Physical Properties
Colour: 
Greyish-black
Crystal System: 
Monoclinic
Streak: 
Reddish Brown
Hardness: 
4 - 4.5
Tenacity: 
Brittle
Synonyms
Synonyms: 
Wolframita