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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
'Apatite'
Aragonite
Armalcolite
Calcite
Chalcopyrite
Chromite
'Clinopyroxene Subgroup'
Diopside
Enstatite
Fluorapatite
Forsterite
var: Peridot
'Hornblende'
Leucite
Magnesiochromite
Magnetite
var: Titaniferous Magnetite

Noonkanbahite
'Olivine'
Oxyphlogopite
Pentlandite
Perovskite
Phlogopite
Potassic-fluoro-richterite
Priderite
Pyrope
Pyrrhotite
var: Nickeloan Pyrrhotite

Quartz
var: Chalcedony

Richterite
Rutile
Sanidine
Shcherbakovite
Spinel
Wadeite


44 entries listed. 24 valid minerals. 1 erroneous literature entry.

Localities in this Region

USA
USA

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

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.

External Links


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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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