Wyomingite

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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