Hübnerite
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Hübnerite or hubnerite is a mineral consisting of manganese tungsten oxide. It is the manganese endmember of the manganese–iron wolframite solid solution series. It forms reddish brown to black monocl
Hübnerite Pasto Bueno, Ancash, Peru
Sample from the Pasto Bueno District, Pallasca Province, Ancash Department, Peru, showing deep red internal reflections when backlit (Size: 6.6 x 4.2 x 1.6 cm)
Hübnerite from the Adams Mine near Silverton, Colorado
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.
Hübnerite
…series is (Fe,Mn)WO4. The predominance of either iron or manganese results in formation of one of two minerals, the compositional end-members FeWO4 (ferberite) and MnWO4 (hübnerite), respectively. Hübnerite is rarer than ferberite because of the difficulty of substituting manganese for iron. There are also…
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