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Cabriite mineral

Palladium-copper-tin intermetallic mineral with current September 2026 IMA-CNMNC approved formula Pd2CuSn (written Pd2SnCu in the original paper), status A, and approval number IMA 1981-057. Evstigneeva and Genkin (1983) described the type polished sections (deposited in the Mineralogical Museum of the Academy of Sciences of the USSR, the Mineralogical Museum of IGEM, Moscow, and the National Mineral Collection at the Geological Survey of Canada, Ottawa) from massive mooihoekite-, putoranite-, and talnakhite-type Cu-Ni sulfide ores of the Oktyabr'sk deposit, Noril'sk district, Krasnoyarsk Krai, Russia (USSR), where it forms grains up to 200 um (and intergrowths up to 4 mm with polarite, sperrylite, paolovite, sobolevskite, froodite, cassiterite, stannite, galena, sphalerite, and native silver). Cameca MS-46 and MAC-400 electron-microprobe analyses of 6 natural grains (Table 2, p. 482) yielded: Analysis 1 (Sb-bearing): Pd 55.5, Sn 27.5, Cu 16.0, Sb 2.2, total 101.2 wt%, empirical formula Pd2.04(Sn0.91Sb0.07)Sigma0.98Cu0.98; Analysis 4 (X-rayed Pt-bearing grain): Pd 49.5, Pt 7.1, Sn 29.2, Cu 15.2, total 101.0 wt%, empirical formula (Pd1.88Pt0.15)Sigma2.03Sn1.00Cu0.97; and Analysis 6: Pd 52.1, Pt 2.6, Sn 30.0, Cu 16.2, total 100.9 wt%, empirical formula (Pd1.94Pt0.05)Sigma1.99Sn1.00Cu1.01 (with overall ranges across the 6 natural analyses of Pd 49.5-55.5, Pt 0-7.1, Ag 0-1.15, Sn 27.5-30.0, Sb 0-2.2, Cu 15.2-16.2 wt%). Gandolfi 57.3-mm powder X-ray diffraction on both natural grain 4 and synthetic Pd2SnCu annealed at 400 degrees C for 100 hours (Table 3, pp. 484-485) indexed on an orthorhombic Pmmm unit cell with a = b = 7.88(5), c = 3.94(2) A, Z = 4, Dcalc = 10.7 g/cm3 (ideal Pd2SnCu) and 11.1 g/cm3 (Pt-bearing grain 4), micro-indentation hardness VHN50 = 258-282 kg/mm2 (mean 272 kg/mm2), representing an ordered 2a x 2a x a superstructure (structural variant 5, Table 4, p. 486) derived below 200 degrees C from a cubic Cu3Au-type (Pd,Cu)3Sn subcell (Pm3m, a = 3.89 A). Distinct from paolovite (Pd2Sn), atokite ((Pd,Pt)3Sn), taimyrite ((Pd,Cu,Pt)3Sn), stannopalladinite, and elemental palladium, platinum, tin, or copper; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Identifiers & Classification

System Identifier Label
IMA IMA:1981-057 Cabriite

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 33, Cabriite row: formula Pd2CuSn, status A, IMA No. 1981-057, country Russia, reference Canadian Mineralogist 21 (1983), 481; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-23)
  2. evstigneeva_1983_cabriite: Evstigneeva TL, Genkin AD (1983), Cabriite Pd2SnCu, a new species in the mineral group of palladium, tin and copper compounds, Canadian Mineralogist 21:481-487. Complete 7-page primary PDF visually inspected: Oktyabr'sk deposit Cu-Ni ore occurrence and paragenesis pp. 481-484; reflectance Table 1 and 6-grain EMPA + synthetic Pd2SnCu analyses Table 2 p. 482; Gandolfi XRD Table 3 and orthorhombic Pmmm ordered superstructure model Table 4 and Figures 6-8 pp. 484-486.
    https://www.rruff.net/doclib/cm/vol21/CM21_481.pdf (accessed 2026-10-23)

Curation History

Timestamp Curator Action Summary
2026-10-23T07:15:00Z antigravity CREATE Created cabriite mineral record with verified IMA:1981-057 identity, Oktyabr'sk deposit 6-grain EMPA chemistry, and orthorhombic Pmmm ordered superstructure from the complete 1983 primary study.

Record source: data/records/cabriite.yaml