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Okanoganite-(Y) mineral

Yttrium-dominant rare-earth fluoro-borosilicate mineral of the vicanite group with current September 2026 IMA-CNMNC approved formula (Y,REE,Ca,Na,Th)16(Fe3+,Ti)(Si,B,P)10(O,OH)38F10, status Rn (renamed), and special-procedure tag 1987 s.p. (originally approved as okanoganite under IMA 1979-048 and suffixed in 1987; listed under 1987 s.p. in the IMA Master List rather than a numbered CURIE). Boggs (1980) described the type specimens (UCSB 8256-8257 and Smithsonian NMNH 142512-142514) from miarolitic cavities in arfvedsonite granite of the Golden Horn batholith near Washington Pass, Okanogan County, Washington, USA, reporting EMPA + carminic-acid spectrophotometric B2O3 analysis (Table 2, p. 1141) and provisional formula (Na,Ca)3(Y,Ce,Nd,La)12Si6B2O27F14. Boiocchi, Callegari, Ottolini, and Maras (2004) re-examined a type-locality crystal from the Golden Horn batholith by combined WDS electron microprobe, SIMS light-element quantification (H, Li, Be, B, F), and single-crystal X-ray diffraction in acentric trigonal space group R3m (a = 10.7108(5), c = 27.0398(11) A, V = 2686.5(3) A3, Z = 3, Robs = 0.0323 for 1857 observed reflections with I > 3sigma(I) out of 1957 unique reflections; Table 6, p. 1542: Y2O3 18.94, Ce2O3 14.37, La2O3 7.60, Nd2O3 7.52, Dy2O3 3.23, Gd2O3 2.69, Sm2O3 2.07, Pr2O3 1.88, Er2O3 1.88, Yb2O3 0.87, Tb2O3 0.48 calc, Tm2O3 0.20 calc, Eu2O3 0.01, CaO 5.50, Na2O 1.87, ThO2 1.87, UO2 0.08, SrO 0.08, BaO 0.08, PbO2 0.01, Fe2O3 2.18, TiO2 0.56, Li2O 0.02, SiO2 14.94, B2O3 3.80, P2O5 0.83, BeO <0.01, H2O 1.33, F 7.07, less O=F 2.98, total 98.99 wt%), establishing isostructurality with vicanite-(Ce) and the revised crystal-chemical formula (Y4.52REE6.82Ca2.65Na1.63Th0.19Sr0.02Ba0.01U0.01)Sigma15.85(Fe3+0.74Ti0.19Li0.04)Sigma0.97(Si6.71P0.32B2.94Be0.01)Sigma9.98(O34.02OH3.98)Sigma38F10.04. Distinct from vicanite-(Ce), hundholmenite-(Y), hellandite-(Y), and elemental yttrium or boron; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 158, Okanoganite-(Y) row: formula (Y,REE,Ca,Na,Th)16(Fe3+,Ti)(Si,B,P)10(O,OH)38F10, status Rn, IMA No. 1987 s.p., country USA, first reference American Mineralogist 65 (1980), 1138, second reference American Mineralogist 89 (2004), 1540; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-22)
  2. boggs_1980_okanoganite: Boggs RC (1980), Okanoganite, a new rare-earth borofluorosilicate from the Golden Horn batholith, Okanogan County, Washington, American Mineralogist 65:1138-1142. Complete 5-page primary PDF visually inspected: Golden Horn batholith occurrence, types UCSB 8256-8257 and NMNH 142512-142514, physical/optical properties, X-ray diffraction Table 1, and EMPA/spectrophotometric composition Table 2 pp. 1138-1142.
    https://www.rruff.net/doclib/am/vol65/AM65_1138.pdf (accessed 2026-10-22)
  3. boiocchi_2004_okanoganite: Boiocchi M, Callegari A, Ottolini L, Maras A (2004), The chemistry and crystal structure of okanoganite-(Y) and comparison with vicanite-(Ce), American Mineralogist 89:1540-1545. Complete 6-page primary PDF visually inspected: trigonal R3m single-crystal refinement and combined EMPA + SIMS + SREF crystal chemistry Tables 1-7 and Figures 1-3 pp. 1540-1545.
    https://www.rruff.net/doclib/am/vol89/AM89_1540.pdf (accessed 2026-10-22)

Curation History

Timestamp Curator Action Summary
2026-10-22T07:20:00Z antigravity CREATE Created okanoganite-(Y) mineral record from the September 2026 IMA master list (1987 s.p., status Rn), complete 1980 Golden Horn batholith original description, and complete 2004 EMPA-SIMS-SREF trigonal R3m crystal-structure refinement.

Record source: data/records/okanoganite-y.yaml