Mindat Logo

Kenna meteorite, Roosevelt Co., New Mexico, USA
This page is currently not sponsored. Click here to sponsor this page.

Latitude: 33°54'0"N
Longitude: 103°33'12"W
 
 
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

Albite
var: Andesine

Augite
Chromite
Diamond
Diopside
Forsterite
Graphite
Iron
var: Kamacite

'K Feldspar'
Lonsdaleite
'Nickel-iron'
'Olivine'
Pigeonite
Troilite


14 entries listed. 9 valid minerals.

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

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.

External Links

<" rel="nofollow">http://www.lpi.usra.edu/meteor/metbull.php> [Link Broken? Jul 2014] = Meteoritical Bulletin Database

Mineral and/or Locality  
Search Google  
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.
Current server date and time: August 2, 2014 06:43:02 Page generated: July 2, 2014 11:25:17
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds