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Twinned Wolframite

The wolframite Mineral Series




Wolframite is not scientifically classified as an individual mineral species by the IMA. However, it is universally recognized as a mineral series, with the minerals Huebnerite and Ferberite being its end members. Huebnerite is the manganese-rich end member, and Ferberite is the iron-rich end member. The term Wolframite can be used generally to describe unspecified members of this group, or to describe the intermediary member of this series. Wolframite is named for its tungsten content, since wolfram means tungsten in German.
Chemical Formula (Mn,Fe)WO4
Composition Manganese iron tungstate
Color Dark red, dark brown, reddish black, dark gray, black
Streak Reddish brown to black
Hardness 4 - 4.5
Crystal System Monoclinic
3D Crystal Atlas
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Crystal Forms
and Aggregates
Most often in long prismatic crystals, columnar groups, blocky and chisel-shaped crystals, and flattened tabular crystals. Also in dense bladed clusters and rosettes, reticulated, acicular, grainy, in veins, encrusting, and massive. Crystals are often striated lengthwise, and may be twinned as repeated twins with a v-shaped notch in the center.
Transparency Opaque. May be translucent in thin splinters or when backlit.
Specific Gravity 7.1 - 7.5
Luster Adamantine, submetallic
Cleavage 1,1. May exhibit parting between crystals.
Fracture Uneven
Tenacity Brittle
Other ID Marks May be weakly attracted to magnets in iron-rich specimens.
In Group Tungstates and Molybdates; Tungstates
Striking Features Heavy weight, color, cleavage, and mode of occurrence.
Environment Tungsten deposits composed of high and medium temperature hydrothermal Quartz veins; also in granite pegmatites.
Rock Type Igneous, Metamorphic
Popularity (1-4) 2
Prevalence (1-3) 3
Demand (1-3) 1

Wolframite ON EBAY

VARIETIES

USES
Wolframite is an important ore of tungsten. Good specimens are not common, and are highly desired by mineral collectors.

NOTEWORTHY LOCALITIES
See Huebnerite and Ferberite for specific localities.

COMMON MINERAL ASSOCIATIONS
Quartz, Hematite, Arsenopyrite, Fluorite, Apatite, Siderite, Dolomite, Cassiterite

DISTINGUISHING SIMILAR MINERALS
Rutile - Harder, crystals are usually thinner.
Goethite - Has a lower specific gravity.
Columbite series - Different crystal form, cleavage less distinguishable.



wolframite PHOTOS
 
ADDITIONAL RESOURCES
 
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