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Petersenite-(Ce) mineral

Anhydrous sodium-cerium carbonate mineral of the burbankite group with current September 2026 IMA-CNMNC approved formula Na4Ce2(CO3)5, status A, and approval number IMA 1992-048. Grice, Van Velthuizen, and Gault (1994) described the cotype specimen (CMN 81511) from pegmatite dikes and Hornfels-hosted alkaline segregations at the Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Electron-microprobe WDS analysis (mean of 3 analyses on 3 grains, Table 1, p. 407) with CO2 calculated by stoichiometry yielded Na2O 17.38, CaO 1.32, BaO 0.32, SrO 1.70, La2O3 14.49, Ce2O3 23.66, Pr2O3 2.00, Nd2O3 5.82, Sm2O3 0.60, CO2 32.92 (calc), total 100.21 wt%, corresponding on the basis of 15 O atoms to the empirical formula (Na3.75Ca0.16)Sigma3.91(Ce0.96La0.59Nd0.23Sr0.11Pr0.08Sm0.02Ba0.01)Sigma2.00(CO3)5. Single-crystal X-ray diffraction refined in monoclinic space group P21 (a = 20.872(4), b = 6.367(1), c = 10.601(2) A, beta = 120.50(1) degrees, V = 1213.9(4) A3, Z = 4, R = 3.5%, Rw = 3.0% for 3506 observed reflections with F > 4sigma(F) out of 3655 unique reflections; Gandolfi powder XRD cell a = 20.84(2), b = 6.351(5), c = 10.580(9) A, beta = 120.43(4) degrees) established a monoclinic burbankite-group superstructure retaining the 2:1 ratio of [8]-coordinated (Na1-Na8) to [10]-coordinated (Ce1-Ce4) cation polyhedra linked by planar carbonate triangles, with lowering of symmetry from hexagonal P63mc driven by Na+/REE3+ cation ordering. The mineral effervesces rapidly in dilute HCl. Distinct from remondite-(Ce), burbankite, khanneshite, 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:1992-048 Petersenite-(Ce)

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 170, Petersenite-(Ce) row: formula Na4Ce2(CO3)5, status A, IMA No. 1992-048, country Canada, reference Canadian Mineralogist 32 (1994), 405; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-22)
  2. grice_1994_petersenite: Grice JD, Van Velthuizen J, Gault RA (1994), Petersenite-(Ce), a new mineral from Mont Saint-Hilaire, and its structural relationship to otheratre rare-earth carbonates, Canadian Mineralogist 32:405-414. Complete 10-page primary PDF visually inspected: occurrence, cotype CMN 81511, and physical/optical properties pp. 405-407; WDS chemical analysis Table 1 and powder XRD Table 2 pp. 407-408; monoclinic P21 crystal-structure refinement Tables 3-5 and Figures 2-4 pp. 408-413.
    https://www.rruff.net/doclib/cm/vol32/CM32_405.pdf (accessed 2026-10-22)

Curation History

Timestamp Curator Action Summary
2026-10-22T07:20:00Z antigravity CREATE Created petersenite-(Ce) mineral record with verified IMA:1992-048 identity, cotype CMN 81511 WDS chemistry, and monoclinic P21 burbankite-group supercell structure from the complete 1994 primary study.

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