Chemical Formula:
(Fe,Mn)WO4
The tungstate of ferrous iron and manganese. Wolframite is the isomorphous mixture of manganese and iron tungstates. The nearly pure end members are the minerals hubnerite (Mn rich)and ferberite (Fe rich).
The tungstate of ferrous iron and manganese. Wolframite is the isomorphous mixture of manganese and iron tungstates. The nearly pure end members are the minerals hubnerite (Mn rich)and ferberite (Fe rich).
Colors: Brownish Black.
Streak from nearly black to red-brown.
Streak from nearly black to red-brown.
Hardness: 5 to
5.5
Density: 7.2 to
7.5
Cleavage: Perfect cleavage on (010).
Crystallography:
Monoclinic
Crystals commonly tabular parallel to the orthopinacoid, giving bladed forms. Found in bladed, lamellar or columnar forms. Twins are fairly common. The mineral also occurs in lamellar and granular masses.
Crystals commonly tabular parallel to the orthopinacoid, giving bladed forms. Found in bladed, lamellar or columnar forms. Twins are fairly common. The mineral also occurs in lamellar and granular masses.
Luster:
Submetallic to resinous luster. It is slightly translucent to opaque.
Submetallic to resinous luster. It is slightly translucent to opaque.
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