Wyomingite

For a resident of the U.S. state of Wyoming, see Wyoming.

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

• Nephrite  – Variety of jade – the state gemstone of Wyoming

References

1. Orlova, M. P. (March 1991). "Classification and Nomenclature of Rocks of the Lamproite Series" . International Geology Review. 33 (3): 263–268. doi:10.1080/00206819109465691. ISSN   0020-6814.
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, Alok Krishna (2015), Gupta, Alok Krishna (ed.), "Experimental Studies on K-Rich Rocks" , Origin of Potassium-rich Silica-deficient Igneous Rocks, New Delhi: Springer India, pp. 381–420, doi:10.1007/978-81-322-2083-1_13, ISBN   978-81-322-2083-1 , retrieved 2024-09-30
4. "Oscar Plug, Ellendale, Derby-West Kimberley Shire, Western Australia, Australia".
5. "Phlogopite lamproite".