A series of lamproite occurences in the area NE of Rock Springs - except for Pilot Butte, which is West of Rock Springs.
Lamproites are ultrapotassic volcanic rocks, and form cinder cones, lava flows, 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 (fluoro-potassicrichterite, priderite, shcherbakovite...)
Ref: Mitchell R.H. & Bergman S.C. (1991) Petrology of Lamproites, Plenum Press, New-York, 447 pp.
Mitchell, Roger H. and Chakhmouradian (1999): Sr-Bearing Perovskite and Loparite from Lamproite and Agpaitic Nepheline Syenite Pegmatites (Canadian Mineralogist 37:99-112).
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: 2463-2489.
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