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CMMMech > Mineral > Bainbridgeite-(YCe)

Bainbridgeite-(YCe) mineral

An approved sodium-barium-yttrium-cerium carbonate mineral, IMA 2020-065, with ideal IMA-CNMNC September 2026 formula Na2Ba2YCe(CO3)6(H2O)3. The suffix denotes dominant cations at distinct crystallographic sites. Lykova et al. (2024, Part 3) characterized holotype CMNMC 46324 from Mont Saint-Hilaire, Canada. Its five electron-microprobe analyses average 8.24 wt% Y2O3 and 8.38 wt% Ce2O3 (Table 1); the other specimens in that table are separate. Analyses used 20 kV, 10 nA, 20–50 micrometre beams and beam-instability corrections. CO2 and H2O were calculated, not measured; infrared data support water qualitatively. The 293 K single-crystal model is triclinic P1, R1 = 0.040, with twinning. Poor crystal quality, omitted Ca, Ce/Dy scattering proxies for lighter/heavier lanthanides, constrained occupancies and unlocated hydrogen limit atom-specific interpretation. Table 6 gives unequal measured and assigned-model scattering values for Y6 (40.1 versus 38.3 electrons). The 2026 Part 5 follow-up identifies a bainbridgeite-(NdCe) rim on the photographed YCe holotype crystal, with a YCe core and an intermediate YCe/alicewilsonite-(YCe) zone. Accordingly, the 2024 chemistry is a specimen-resolved analysis, not a homogeneous whole-crystal assay; the 2026 mixed-phase diffraction model is not substituted for it. This mineral is distinct from bainbridgeite-(NdCe), alicewilsonite-(YCe), elements and ores. Natural intergrowth and proposed geological replacement are not controlled transformation evidence. The qualitative aqueous-HCl effervescence observation has no concentration, duration or yield and is not curated as recovery. No microbial process, industrial deployment or inherited elemental criticality is established by these characterizations.

Identifiers & Classification

System Identifier Label
IMA IMA:2020-065 Bainbridgeite-(YCe)

Sources & References

  1. ima2026: IMA-CNMNC, The New IMA List of Minerals, September 2026; field definitions PDF page 1 and Bainbridgeite-(YCe) row page 19 (approved, 2020-065).
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-16)
  2. lykova2024part3: Lykova I, Rowe R, Poirier G, Friis H and Helwig K (2024), Mckelveyite group minerals – Part 3: Bainbridgeite-(YCe), Na2Ba2YCe(CO3)6·3H2O, a new species from Mont Saint-Hilaire, Canada. European Journal of Mineralogy 36:183–194. DOI 10.5194/ejm-36-183-2024. Holotype pp.184–185; methods p.187; chemistry Table 1; structure Tables 3–6 and Figures 4–5; natural zoning Figures 1–2; HCl observation p.187.
    https://doi.org/10.5194/ejm-36-183-2024 (accessed 2026-10-16)
  3. lykova2024part3supplement: Official supplement to Lykova et al. (2024), Part 3: Supplement/bainbridgeite-(YCe).cif and bainbridgeite-(YCe).xy. CIF identity, 293(2) K measurement, P1 symmetry, constrained atom-site model and hydrogen-treatment metadata checked; XY is the associated powder pattern, not an independent experiment.
    https://ejm.copernicus.org/articles/36/183/2024/ejm-36-183-2024-supplement.zip (accessed 2026-10-16)
  4. lykova2026part5: Lykova I, Rowe R, Poirier G, Friis H, Ojaste K and Barnes S (2026), Mckelveyite group minerals – Part 5: Bainbridgeite-(NdCe), Na2Ba2NdCe(CO3)6·3H2O, a new neodymium and cerium-dominant species from Mont Saint-Hilaire, Canada. European Journal of Mineralogy 38:419–429. DOI 10.5194/ejm-38-419-2026. Context only: occurrence/methods pp.420–421, Figures 1–2 identify YCe core, intermediate zone and NdCe rim; p.421 explicitly limits both diffraction analyses to mixed phases.
    https://doi.org/10.5194/ejm-38-419-2026 (accessed 2026-10-16)

Curation History

Timestamp Curator Action Summary
2026-10-16T05:13:01.151693Z codex /root/round104_ree (GPT-6; codex) CREATE Added the approved YCe carbonate identity, qualified holotype analyses and constrained structural model; retained the 2026 NdCe-rim identification and excluded unsupported recovery or criticality.

Record source: data/records/bainbridgeite-yce.yaml