Kuliokite-(Y) mineral
A natural yttrium-bearing aluminium fluorosilicate mineral, with current IMA formula Y4Al(SiO4)2(OH)2F5 and approval 1984-064. The accepted primary characterization is a 2025 re-investigation of Ploskaya Mountain, Kola Peninsula, Russia, material from the type locality, not an assertion that the analysed crystals are the original holotype. Wavelength-dispersive microprobe analyses of three crystals, each averaging 4–7 spots, show variable Yb and other heavy rare-earth contents; water was calculated from structural data rather than measured directly. A single-crystal refinement at 293(2) K supports monoclinic Im symmetry, replacing the triclinic interpretation discussed in the paper. The model used mixed Y/Yb scattering curves with total occupancy constrained to one for each Y site; those occupancies are not separate direct assays of every lanthanide at each site. Its seven-coordinate Y2 site was interpreted as favouring heavier REEs relative to eight-coordinate Y1. This is a crystal-chemical interpretation of natural material, not a demonstrated separation or recovery process. Only one hydrogen position was located; the F3 hydroxyl/fluoride ratio was fixed during refinement. The studied sample's idealized (OH)2.5F4.5 composition differs from the current IMA end-member formula. Suggested fluorokuliokite and hydroxykuliokite species remain hypothetical in this study and are not aliases or new records. The 1986 original descriptions and the 1993 natural-alteration study are contextual citations within the 2025 paper, not independently acquired evidence here. No criticality-list designation, microbial mechanism, laboratory synthesis, extraction yield or industrial deployment is asserted.
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Identifiers & Classification
| System | Identifier | Label |
|---|---|---|
| IMA |
IMA:1984-064
|
Kuliokite-(Y) |
Sources & References
-
ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026; definitions PDF page 1 and Kuliokite-(Y) row page 118, approved 1984-064, formula Y4Al(SiO4)2(OH)2F5.
https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-16) -
krivovichev2025: Krivovichev SV, Yakovenchuk VN, Goychuk OF and Pakhomovsky YA (2025), Coordination-Driven Rare Earth Fractionation in Kuliokite-(Y), (Y,HREE)4Al(SiO4)2(OH)2F5: A Crystal–Chemical Study. Minerals 15:1064, DOI 10.3390/min15101064. Full sixteen-page primary PDF and publisher XML inspected; specimen/methods pp.2–4, Tables 1–5 pp.3–6, Figures 1–9, site-scattering comparison p.7, hydrogen limitations p.10 and explicitly hypothetical species p.11. Table 1's chemical mean site-scattering factor 47.31 electrons and the structural average 46.29 electrons are not identical; the latter is closer to crystal 3's 46.14 electrons. This variation is retained, without assigning the diffraction crystal to a particular analytical row. CSD 2482967 is the deposit cited by the paper; its CIF was not acquired at curation, so no independent re-refinement is claimed.
https://mdpi-res.com/d_attachment/minerals/minerals-15-01064/article_deploy/minerals-15-01064.pdf (accessed 2026-10-16)
Curation History
| Timestamp | Curator | Action | Summary |
|---|---|---|---|
2026-10-16T09:28:27.054956Z |
codex /root/round104_ree (GPT-6; codex) | CREATE | Added verified mineral identity and qualified natural-material crystal characterization, without transferring hypothetical species or recovery claims. |
2026-10-22T13:21:23Z |
claude (claude-opus-4-6; antigravity) | EDIT | Normalize IMA-CNMNC Master List source id from ima2026 to canonical ima_2026_09 (Issue #817). |
Record source: data/records/kuliokite-y.yaml