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Lukechangite-(Ce) mineral

Anhydrous sodium-cerium fluorocarbonate mineral with current September 2026 IMA-CNMNC approved formula Na3Ce2(CO3)4F, status A, and approval number IMA 1996-033. Grice and Chao (1997) described the cotype specimen (CMNMI 81535, formerly provisional phase UK80) from a pegmatite vein at the Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada, where it occurs with microcline, sodalite, catapleiite, fluorite, aegirine, siderite, astrophyllite, and Petersenite-(Ce). Electron-microprobe WDS analysis (mean of 5 analyses on 1 grain, p. 1257) with CO2 calculated by stoichiometry yielded Na2O 14.94, CaO 0.10, SrO 0.12, La2O3 16.36, Ce2O3 29.48, Pr2O3 1.95, Nd2O3 5.88, F 3.58, CO2 28.40 (calc), less O=F 1.51, total 99.30 wt%, corresponding on the basis of 4 C atoms (13 anions) to the empirical formula (Na2.99Ca0.01Sr0.01)Sigma3.01(Ce1.11La0.62Nd0.22Pr0.07)Sigma2.02(CO3)4F1.17. Single-crystal X-ray diffraction refined in hexagonal space group P63/mmc (single-crystal cell a = 5.0612(8), c = 22.820(9) A, V = 506.2(2) A3; Debye-Scherrer powder XRD cell a = 5.068(1), c = 22.87(5) A, V = 509(1) A3, Z = 2, R = 3.4%, wR = 4.0% for 335 observed reflections with F > 5sigma(F) out of 399 unique reflections) confirmed that lukechangite-(Ce) is isostructural with synthetic Na3La2(CO3)4F, featuring layered sheets of [CeO9], [Na1O6F2], [Na2O6], and [CO3] polyhedra stacked along c. The mineral is soluble with effervescence in 1:1 HCl. Distinct from cordylite-(Ce), baiyuneboite-(Ce) (cordylite-(Ce) synonym/polytype), huanghoite-(Ce), and elemental cerium; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Identifiers & Classification

System Identifier Label
IMA IMA:1996-033 Lukechangite-(Ce)

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 129, Lukechangite-(Ce) row: formula Na3Ce2(CO3)4F, status A, IMA No. 1996-033, country Canada, reference American Mineralogist 82 (1997), 1255; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-22)
  2. grice_1997_lukechangite: Grice JD, Chao GY (1997), Lukechangite-(Ce), a new rare-earth fluorocarbonate mineral from Mont Saint-Hilaire, Quebec, American Mineralogist 82:1255-1260. Complete 6-page primary PDF visually inspected: occurrence, cotype CMNMI 81535, and physical/optical properties pp. 1255-1257; WDS chemical analysis and powder XRD Table 1 p. 1257; hexagonal P63/mmc crystal-structure refinement Tables 2-3 and Figures 2-5 pp. 1257-1260.
    https://www.rruff.net/doclib/am/vol82/AM82_1255.pdf (accessed 2026-10-22)

Curation History

Timestamp Curator Action Summary
2026-10-22T07:20:00Z antigravity CREATE Created lukechangite-(Ce) mineral record with verified IMA:1996-033 identity, cotype CMNMI 81535 WDS chemistry, and hexagonal P63/mmc crystal structure from the complete 1997 primary study.

Record source: data/records/lukechangite-ce.yaml