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Leucite Hills District, Sweetwater Co., Wyoming, USA

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A series of lamproite occurrences in the area NE of Rock Springs - except for Pilot Butte, which is west of Rock Springs.

Lamproites are ultrapotassic volcanic rocks, forming cinder cones, lava flows and volcanic necks. The outcrops consist of hills (the Leucite Hills) due to differential erosion. Due to the extremely high potassium content of the lamproites, some have been mined for fertilizer (e.g., Zirkel Mesa), and most are still considered mining prospects for potassium. Lamproites can contain rare minerals enriched in K, Ti (potassic-fluoro-richterite, priderite, noonkanbahite...).

Mineral List

Mineral list contains entries from the region specified including sub-localities

27 valid minerals. 1 erroneous literature entry.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Kuehner, S. M., Edgar, A. D., & Arima, M. (1981), Petrogenesis of the ultrapotassic rocks from the Leucite Hills, Wyoming. American Mineralogist: 66: 663-677.

Mitchell, R. H. & Bergman, S. C. (1991), Petrology of Lamproites. Plenum Press, New-York, 447 pp.

Mitchell, R. H. and Chakhmouradian, A. R. (1999), Sr-Bearing Perovskite and Loparite from Lamproite and Agpaitic Nepheline Syenite Pegmatites. Canadian Mineralogist: 37: 99-112.

Hausel, W. D. & Jacobson, M. I. (2001), Wyoming Mineral Locality Index. Rocks & Minerals: 76(6): 390.

Sharygin, V.V., et al. (2003), Ni-rich sulfide inclusions in early lamproite minerals. Russian Geology and Geophysics: 44(9): 855-866.

Mirnejad, H. & Bell, K. (2006), Origin and Source Evolution of the Leucite Hills Lamproites: Evidence from Sr–Nd–Pb–O Isotopic Compositions. Journal of Petrology: 47(12): 2463-2489.

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