Ferberite
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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 tungstate, FeWO4.
Ferberite with muscovite from Minas da Panasqueira, Beira Baixa, Portugal
Twinned Ferberite, Tazna Mine, Atocha-Quechisla District, Nor Chichas Province, Potosí Department, Bolivia. 4.8 × 4.0 × 3.6 cm.
Ferberite – Cínovec / Zinnwald, Erzgebirge; Krusné Hory Mts, Saxony and Ústí Region (Bohemia), Germany and Czech Republic
Wolframite
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Wolframite is an iron, manganese, and tungstate mineral with a chemical formula of WO4 that is the intermediate mineral between ferberite and hübnerite. Along with scheelite, the wolframite series are
Ferberite
…black monoclinic mineral composed of iron(II) tungstate, FeWO4. Ferberite and hübnerite often contain both divalent cations of iron and manganese, with wolframite as the intermediate species for which the solid solution series is named. Ferberite occurs as granular masses and as slender prismatic crystals. It has…
Wolframiteportugal 3
Diagram of wolframite crystal's front view
Tungstic acid (WO3) in powder form