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Manganokhomyakovite mineral

Manganokhomyakovite (IMA 1998-043) is an IMA-accepted sodium-strontium-calcium-manganese-zirconium-tungsten cyclosilicate mineral of the eudialyte group, the Mn-dominant analogue of khomyakovite, with IMA September 2026 Master List formula Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(Cl,OH)2 and empirical formula (Na11.51K0.30Ca0.25Sr0.04REE0.07)Sigma12.17Sr3Ca6(Mn2.04Fe1.23)Sigma3.27(Zr2.91Hf0.03Ti0.01)Sigma2.95(W0.66Nb0.41Ta0.01)Sigma1.08(Si24.60Al0.01)Sigma24.61O73(O,OH,H2O)Sigma3.70(OH1.19Cl0.81)Sigma2. Described by Johnsen et al. (1999) from miarolitic cavities in nepheline syenite at the Demix quarry (now part of the Poudrette quarry), Mont Saint-Hilaire, Rouville County, Quebec, Canada (cotypes CMNMC 81558 and 81559). WDS electron microprobe analysis (4-analysis mean, p. 896) gives Na2O 10.37, K2O 0.41, CaO 10.2, MnO 4.21, FeO 2.58, SrO 9.17, Al2O3 0.02, La2O3 0.12, Ce2O3 0.2, SiO2 42.98, TiO2 0.02, ZrO2 10.43, HfO2 0.17, Nb2O5 1.58, Ta2O5 0.03, WO3 4.48, Cl 0.84, stoichiometric H2O 0.83, -O=Cl 0.19, total 98.45 wt%. Trigonal (space group R3m), with a = 14.282(3) Å, c = 30.12(1) Å, V = 5320(2) Å3, Z = 3, Dmeas = 3.13(3) g/cm3, Dcalc = 3.17 g/cm3, Mohs hardness 5–6, and uniaxial (–) optics with omega = 1.629(1) and epsilon = 1.626(2).

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Identifiers & Classification

System Identifier Label
IMA IMA:1998-043 Manganokhomyakovite

Sources & References

  1. ima_2026_09: IMA-CNMNC (Pasero M., 2026), The New IMA List of Minerals – A Work in Progress (Updated: September 2026), PDF p. 135, Manganokhomyakovite row: status A, IMA 1998-043, formula Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(Cl,OH)2, reference Johnsen O., Grice J.D., Gault R.A. (1999) The Canadian Mineralogist 37, 893-899.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-24)
  2. johnsen_1999_manganokhomyakovite: Johnsen O, Gault RA, Grice JD, and Ercit TS (1999), Khomyakovite and manganokhomyakovite, two new members of the eudialyte group from Mont Saint-Hilaire, Quebec, Canada, The Canadian Mineralogist 37:893-899.
    https://www.rruff.net/doclib/cm/vol37/CM37_893.pdf (accessed 2026-10-24)

Curation History

Timestamp Curator Action Summary
2026-10-24T07:30:00Z antigravity CREATE Created mineral record for Manganokhomyakovite (IMA:1998-043) from the IMA September 2026 Master List and the primary type-description paper by Johnsen, Grice, and Gault (1999) in The Canadian Mineralogist 37:893-899.
2026-10-24T10:45:00Z antigravity EDIT Resolved CMM120-F11 (issue #838) by correcting the occurrence to miarolitic cavities in nepheline syenite at the Demix quarry (now Poudrette quarry), replacing the oxide list with the exact p. 896 4-analysis mean (total 98.45 wt%, Ta2O5 0.03 wt%), and simplifying sources[1].title to a concise bibliographic citation.
2026-10-24T11:27:00Z antigravity EDIT Applied reviewed conservative correction for CMM120-F11 (issue #838): corrected primary source author order to Johnsen, Gault, Grice, and Ercit (1999) in sources[1].title and Johnsen et al. (1999) in description.

Record source: data/records/manganokhomyakovite.yaml