Wolframite contains (Fe, Mn) WO4 and is a transition mineral of the ferberite-huebnerite ore series. It has a monoclinic structure, and the crystals appear as columnar or blocky aggregates. Crystal twinning is common. It is brownish black with reddish brown to black streaks, translucent to opaque diaphaneity, a sub-metallic lustre, a specific gravity of 7.1–7.5, a Mohs hardness of 4–4.5, and uneven fractures. It usually forms in quartz veins of granitic pegmatite and is often associated with cassiterite and arsenopyrite.
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(2020). Wolframite. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_2783
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DOI: https://doi.org/10.1007/978-981-13-2538-0_2783
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