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Manganokukisvumite mineral

Hydrated sodium-manganese(II)-titanium chain silicate mineral with current September 2026 IMA-CNMNC approved formula Na6MnTi4Si8O28·4H2O, status A, and approval number IMA 2002-029. Gault, Ercit, Grice, and Van Velthuizen (2004) described the cotype specimens (CMNMC 83392 and CMNMC 83393, Canadian Museum of Nature, Ottawa, formerly cataloged as unknown UK 112) from small cavities in an albite-rich syenite breccia block at the Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada, where it occurs with albite, aegirine, epididymite, elpidite, ankerite, calcite, nenadkevichite, polylithionite, quartz, and rhodochrosite (and also verified Mn-dominant core zones in zoned kukisvumite from Mount Kukisvumchorr, Khibina alkaline massif, Kola Peninsula, Russia). JEOL 733 WDS electron-microprobe analysis of the Mont Saint-Hilaire cotype (mean of 2 analyses, Table 1, p. 783, with H2O calculated for 4 H2O by analogy with kukisvumite and lintisite) yielded SiO2 41.74, TiO2 26.90, Nb2O5 0.68, Al2O3 0.16, Ce2O3 0.18, FeO 0.57, MnO 5.48, MgO 0.26, CaO 0.08, Na2O 15.61, K2O 0.21, H2O 6.25 (calc), total 98.12 wt%, corresponding on the basis of 32 O atoms to the empirical formula (Na5.81K0.05Ca0.02Ce0.01)Sigma5.89(Mn0.89Fe0.09Mg0.07Al0.04)Sigma1.09(Ti3.88Nb0.06)Sigma3.94Si8.01O28·4H2O. 114.6-mm Debye-Scherrer powder X-ray diffraction (Table 2, p. 784) indexed in orthorhombic space group Pccn with a = 29.05(2), b = 8.612(6), c = 5.220(4) A, V = 1305.9(3) A3, Z = 2, Dmeas = 2.86(1) g/cm3 (heavy liquids), Dcalc = 2.88 g/cm3, Mohs hardness 5.5-6, and biaxial negative optics (alpha(calc) = 1.657, beta = 1.744(3), gamma = 1.792(3), 2Vmeas = 70 degrees). Distinct from kukisvumite (the Zn-dominant analogue Na6ZnTi4Si8O28·4H2O), lintisite (Na3LiTi2Si4O14·2H2O), elpidite, and elemental manganese, titanium, or niobium; no criticality designation, microbial mechanism, or industrial recovery yield is asserted.

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Identifiers & Classification

System Identifier Label
IMA IMA:2002-029 Manganokukisvumite

Sources & References

  1. ima_2026_09: IMA-CNMNC, The New IMA List of Minerals, September 2026, PDF page 135, Manganokukisvumite row: formula Na6MnTi4Si8O28·4H2O, status A, IMA No. 2002-029, country Canada, reference Canadian Mineralogist 42 (2004), 781; column definitions on PDF page 1.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-23)
  2. gault_2004_manganokukisvumite: Gault RA, Ercit TS, Grice JD, Van Velthuizen J (2004), Manganokukisvumite, a new mineral species from Mont Saint-Hilaire, Quebec, Canadian Mineralogist 42:781-785. Complete 5-page primary PDF visually inspected: Poudrette quarry occurrence and cotypes CMNMC 83392-83393 pp. 781-783; WDS EMPA composition of Mont Saint-Hilaire and Khibina specimens Table 1 p. 783; orthorhombic Pccn powder XRD Table 2 pp. 784-785.
    https://www.rruff.net/doclib/cm/vol42/CM42_781.pdf (accessed 2026-10-23)

Curation History

Timestamp Curator Action Summary
2026-10-23T07:15:00Z antigravity CREATE Created manganokukisvumite mineral record with verified IMA:2002-029 identity, Poudrette quarry cotype CMNMC 83392-83393 WDS chemistry, and orthorhombic Pccn crystallography from the complete 2004 primary study.

Record source: data/records/manganokukisvumite.yaml