Ferberite

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What Wikipedia says

Ferberite is the iron endmember of the manganese–iron wolframite solid solution series. The manganese endmember is hübnerite. Ferberite is a black monoclinic mineral composed of iron(II) tungstate, FeWO4.

Excerpt from the Wikipedia article “Ferberite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ivar Leidus, CC BY-SA 4.0, via Wikimedia Commons.