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Ferrowodginite mineral

Anhydrous iron(II)-tin(IV)-tantalum oxide mineral of the wodginite group with current September 2026 IMA-CNMNC approved formula Fe2+Sn4+Ta2O8, status A, and approval number IMA 1984-006. Ercit, Cerny, and Hawthorne (1992) described the type specimen (SK-1, from sample A5234 of the J. Siivola collection, Geological Survey of Finland, originally collected from the Sukula granitic pegmatite near the Makitulokas farm house in the Tammela-Somero pegmatite province, southwestern Finland), where it forms 0.01-0.2 mm inclusions rimmed by a 10 um zone of stannomicrolite ('sukulaite') and coexisting with tapiolite and native bismuth inside tantalian cassiterite ('ainalite'). MAC 5 EDS electron-microprobe analysis of type specimen SK-1 (mean of 2 analyses, Table 3, p. 636, with Fe2+/Fe3+ partitioned by wodginite stoichiometry) yielded Ta2O5 56.3, Nb2O5 14.8, SnO2 10.1, FeO 9.3, TiO2 4.3, MnO 2.8, Fe2O3 1.9, total 99.4 wt%, corresponding on the basis of 32 O atoms per unit cell (Z = 4) to the empirical formula (Fe2+3.04Mn0.93[]0.03)Sigma4(Sn1.58Ti1.27Fe3+0.55Ta0.60)Sigma4(Ta5.38Nb2.62)Sigma8O32 (or per 8 O atoms: (Fe2+0.76Mn0.23[]0.01)(Sn0.40Ti0.32Ta0.15Fe3+0.14)(Ta1.35Nb0.66)O8). Single-crystal precession and 114.6-mm Gandolfi powder X-ray diffraction (Table 4, p. 637) refined in monoclinic space group C2/c (or Cc) with a = 9.415(7), b = 11.442(6), c = 5.103(4) A, beta = 90.8(1) degrees, V = 549.7(6) A3, Z = 4, Dcalc = 7.02 g/cm3, and Mohs hardness 5.5. Distinct from wodginite (Mn2+Sn4+Ta2O8), ferrotitanowodginite (Fe2+TiTa2O8), ferrotapiolite, ixiolite, and elemental tantalum, tin, niobium, or titanium; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Identifiers & Classification

System Identifier Label
IMA IMA:1984-006 Ferrowodginite

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 72, Ferrowodginite row: formula Fe2+Sn4+Ta2O8, status A, IMA No. 1984-006, country Finland, reference Canadian Mineralogist 30 (1992), 633; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-23)
  2. ercit_1992_ferrowodginite: Ercit TS, Cerny P, Hawthorne FC (1992), The wodginite group. III. Classification and new species, Canadian Mineralogist 30:633-638. Complete 6-page primary PDF visually inspected: wodginite-group classification and nomenclature Tables 1-2 pp. 633-635; Sukula pegmatite ferrowodginite occurrence (sample SK-1 / A5234), microprobe composition Table 3, and monoclinic C2/c Gandolfi powder XRD Table 4 pp. 635-637.
    https://www.rruff.net/doclib/cm/vol30/CM30_633.pdf (accessed 2026-10-23)

Curation History

Timestamp Curator Action Summary
2026-10-23T07:15:00Z antigravity CREATE Created ferrowodginite mineral record with verified IMA:1984-006 identity, Sukula pegmatite holotype SK-1 microprobe chemistry, and monoclinic C2/c wodginite-group crystallography from the complete 1992 primary study.

Record source: data/records/ferrowodginite.yaml