Wyomingite is a type of volcanic rock. Specifically, it is a diopside-leucite phlogopite lamproite.[1] It is a potassium enriched, alkaline, basic, phonolite first found in the Leucite Hills of Sweetwater County, Wyoming.[2] Wyomingites are between foidite and tephri-phonolite in composition (in the QAPF classification) and contain leucite (20-25%), augite, phlogopite, apatite, calcite, magnetite and small amounts of olivine (but the latter may be absent).[3] Silica (SiO2) content is between 48.9% and 51.7%. Common groundmass includes potassium-richterite. Wyomingite has also been found at two locations in Australia: West Kimberley,[4] and near Ballina, New South Wales.[5]

Wyomingite plots in the phonolite field in the TAS classification.

See also

References

  1. ↑ M. P. Orlova (1991) CLASSIFICATION AND NOMENCLATURE OF ROCKS OF THE LAMPROITE SERIES, International Geology Review, 33:3, 263-268, https://doi.org/10.1080/00206819109465691 pp. 265
  2. ↑ Sobolev, V. S.; Bazarova, T. Ju.; Yagi, Kenzo (1975-12-01). "Crystallization temperature of wyomingite from Leucite Hills". Contributions to Mineralogy and Petrology. 49 (4): 301–308. Bibcode:1975CoMP...49..301S. doi:10.1007/BF00376182. ISSN 1432-0967. S2CID 129836750.
  3. ↑ Gupta, A.K. (2015) Experimental Studies on K-Rich Rocks. In Origin of Potassium-rich Silica-deficient Igneous Rocks. Springer India. https://doi.org/10.1007/978-81-322-2083-1_13 pages 80 and 82
  4. ↑ "Oscar Plug, Ellendale, Derby-West Kimberley Shire, Western Australia, Australia".
  5. ↑ "Phlogopite lamproite".
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