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Ferrotitanowodginite mineral

Anhydrous iron(II)-titanium-tantalum oxide mineral of the wodginite group with current September 2026 IMA-CNMNC approved formula Fe2+TiTa2O8, status A, and approval number IMA 1998-028. Galliski, Cerny, Marquez-Zavalia, and Chapman (1999) described the holotype specimen (catalog no. 8554, Museum Prof. Manuel Tellechea, IANIGLA-CRICYT-CONICET, Mendoza, Argentina) from the San Elias (lepidolite-subtype) granitic pegmatite and additional material from the nearby La Viquita (spodumene-subtype) pegmatite in the Sierra de la Estanzuela (32 deg 51 min S, 65 deg 06 min W), Chacabuco department, San Luis Province, Argentina, where it occurs in complex oxide nodules alongside microlite, ferrowodginite, wodginite, titanowodginite, ferrotapiolite, and ferrocolumbite. Cameca SX50 WDS electron-microprobe analysis of the San Elias type specimen (mean of 18 analyses, Table 3, p. 775; Fe2+/Fe3+ partitioned by 16-cation / 32-oxygen stoichiometry) yielded Ta2O5 70.68, FeO 10.26 (printed 10.27 in the abstract), TiO2 7.10, Nb2O5 6.52, Fe2O3 2.19 (2.18 in abstract), SnO2 1.25, MnO 1.05, PbO 0.05, As2O3 0.03, Bi2O3 0.03, WO3 0.02, UO2 0.02, Sb2O3 0.02, ThO2 0.01, MgO 0.01, CaO 0.01, total 99.25 wt%, corresponding on the basis of 8 O atoms to the empirical formula (Fe2+0.869Mn2+0.088[]0.039Mg0.001Ca0.001Sb3+0.001Pb2+0.001)Sigma1.000(Ti4+0.540Ta0.244Fe3+0.166Sn4+0.050)Sigma1.000(Ta1.702Nb0.297)Sigma1.999O8 (La Viquita mean of 13 analyses: Ta2O5 65.50, FeO 10.74, TiO2 7.21, Nb2O5 8.48, Fe2O3 3.21, SnO2 2.41, MnO 1.62, total 99.32 wt%). Philips 1710 powder X-ray diffraction (Table 4, p. 776) refined in monoclinic space group C2/c (Z = 4) gave a = 9.403(4), b = 11.384(3), c = 5.075(1) A, beta = 90.55(2) degrees, V = 543.24(22) A3, and Dcalc = 7.368 g/cm3 for San Elias (and a = 9.431(2), b = 11.419(3), c = 5.089(1) A, beta = 90.42(2) degrees, V = 548.10(16) A3, Dcalc = 7.147 g/cm3 for La Viquita; Mohs hardness 5.5). Distinct from titanowodginite (Mn2+TiTa2O8), ferrowodginite (Fe2+Sn4+Ta2O8), wodginite (Mn2+Sn4+Ta2O8), and elemental tantalum, niobium, titanium, or tin; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Identifiers & Classification

System Identifier Label
IMA IMA:1998-028 Ferrotitanowodginite

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 72, Ferrotitanowodginite row: formula Fe2+TiTa2O8, status A, IMA No. 1998-028, country Argentina, reference American Mineralogist 84 (1999), 773; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-23)
  2. galliski_1999_ferrotitanowodginite: Galliski MA, Cerny P, Marquez-Zavalia MF, Chapman R (1999), Ferrotitanowodginite, Fe2+TiTa2O8, a new mineral of the wodginite group from the San Elias pegmatite, San Luis, Argentina, American Mineralogist 84:773-777. Complete 5-page primary PDF visually inspected: San Elias and La Viquita pegmatite occurrences and holotype 8554 pp. 773-774; reflectance Table 2 and 31-point WDS EMPA chemistry Table 3 pp. 774-775; monoclinic C2/c powder XRD and unit cells Table 4 pp. 775-777.
    https://www.rruff.net/doclib/am/vol84/AM84_773.pdf (accessed 2026-10-23)

Curation History

Timestamp Curator Action Summary
2026-10-23T07:15:00Z antigravity CREATE Created ferrotitanowodginite mineral record with verified IMA:1998-028 identity, San Elias and La Viquita pegmatite WDS chemistry, and monoclinic C2/c wodginite-group crystallography from the complete 1999 primary study.

Record source: data/records/ferrotitanowodginite.yaml