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Kenna meteorite, Roosevelt Co., New Mexico, USA

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Latitude & Longitude (WGS84): 33° 53' 59'' North , 103° 33' 11'' West
Latitude & Longitude (decimal): 33.90000,-103.55333
Non-native locality type:Meteorite
Meteorite Class:Ureilite meteorite
Meteoritical Society Class: Ureilite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Achondrite, ureilite, found in 1972.
10.9 kg, a single weathered stone


The Kenna ureilite is the fourth largest ureilite and the only one of these four which has, until now at least, been extensively studied. Kenna is dominated by equigranular olivine and pigeonite (~90 vol%; ~ 3:1 ratio). However, like all ureilites, it also contains a carbonaceous matrix representing ≥10% of the meteorite. The silicates are separated by veins of the carbonaceous material which contains the common carbon polymorphs — diamond, graphite, and lonsdaleite. Kenna is somewhat unusual in that the matrix material also includes secondary melt inclusions with K-feldspar, Ca-rich clinopyroxene, chromite, metal, and glass. The olivines possess homogeneous cores with abrupt zoning near the carbonaceous matrix. Strongly lineated textures, veins, and olivine zoning patterns combine to suggest that the silicates were first a cumulus or adcumulus aggregate before the carbonaceous material was added or injected.

As a weathered meteorite, textural interpretations of Kenna are, of course, complicated as veins of hydrous iron oxides — accompanied by residual Fe-Ni metal and minor troilite — also separate the silicates.

Mineral List


11 valid minerals.

Meteorite/Rock Types Recorded

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This page 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

John L. Berkley, H. G. Brown, Klaus Keil, N. L. Carter, J.-C C. Mercier & Gary Huss (1976). The Kenna ureilite: An ultramafic rock with evidence for igneous, metamorphic and shock origin. Geochimica et Cosmochimica Acta 40: 1429-1437.

John L. Berkley, G. Jeffrey Taylor, Klaus Keil, George E. Harlow & Martin Prinz (1980). The nature and origin of ureilites. Geochimica et Cosmochimica Acta 44:1579-1597.

Alan Edward Rubin (1997). Mineralogy of meteorite groups. Meteoritics 32 (2): 231-247. (March 1997).

Monica M. Grady (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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