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Narsarsukite

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Narsarsukite is a rare silicate mineral with either the chemical formula Na2(Ti,Fe3+)Si4(O,F)11[3] or Na4(Ti,Fe)4[Si8O20](O,OH,F)4.[1]

It was first described in 1900 for an occurrence in the Narsarsuk pegmatite in the Ilimaussaq intrusive complex of West Greenland.[1] It has also been reported from a syenite which intruded limestone in the Sweetgrass Hills, Montana, and within hornfels and marblexenoliths in the alkalic intrusive of Mont Saint-Hilaire, Quebec.[3] It occurs associated with aegirine, microcline, albite, elpidite, epididymite, taeniolite, pectolite, calcite, galena and quartz.[3]

Narsarsukite from Whitlash, Liberty County, Montana {size: 5.6 x 5.4 x 5.1 cm)

References

  1. 1234Narsarsukite on Mindat.org
  2. ↑Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  3. 1234Handbook of Mineralogy
  4. ↑Narsarsukite data on Webmineral