Ferberite

(repeating unit)FeWO4IMA symbolFeb[1]Strunz classification4.DB.30Crystal systemMonoclinicCrystal classPrismatic (2/m)
(same H-M symbol)Space groupP2/cUnit cella = 4.72, b = 5.7
c = 4.96 [Å]; β = 90°; Z = 2IdentificationColorBlack, dark brown in transmitted lightCrystal habitBladed crystals; massiveTwinningContact or interpenetrant or lamellar twinsCleavagePerfect on {010}; partings on {100} and {102}FractureUnevenTenacityBrittleMohs scale hardness4–4.5LusterSubmetallic to metallic adamantineStreakBrownish blackDiaphaneityNearly to entirely opaqueSpecific gravity7.58Optical propertiesBiaxial (+)Refractive indexnα = 2.255 nβ = 2.305 nγ = 2.414Birefringenceδ = 0.1592V angleMeasured: 66°Other characteristicsSlightly magneticReferences[2][3][4]

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.

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.[5]

Ferberite occurs as granular masses and as slender prismatic crystals. It has a Mohs hardness of 4.5 and a specific gravity of 7.4 to 7.5. Ferberite typically occurs in pegmatites, granitic greisens, and high temperature hydrothermal deposits.[2] It is a minor ore of tungsten.

Ferberite was discovered in 1863 in Sierra Almagrera, Spain, and named after the German mineralogist Moritz Rudolph Ferber (1805–1875).[3]

  • Twinned Ferberite, Tazna Mine, Atocha-Quechisla District, Nor Chichas Province, Potosí Department, Bolivia. 4.8 × 4.0 × 3.6 cm.
    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
    Ferberite – Cínovec / Zinnwald, Erzgebirge; Krusné Hory Mts, Saxony and Ústí Region (Bohemia), Germany and Czech Republic

See also

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Ferberite in the Handbook of Mineralogy
  3. ^ a b Ferberite on Mindat.org
  4. ^ Ferberite data on Webmineral site
  5. ^ Wolframite on Mindat

External links

Look up ferberite in Wiktionary, the free dictionary.
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