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Kenna meteorite, Roosevelt Co., New Mexico, USA

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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



14 entries listed. 9 valid minerals.

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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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