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Northwest Africa 6275
Basic information Name: Northwest Africa 6275
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6275
Observed fall: No
Year found: 2010
Country: Mauritania
Mass:help 1.3 g
Meteoritical Bulletin:  MB 99  (2011)  Lunar (feld. brec.)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 314 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 15 Apr 2011
Writeup from MB 99:

Northwest Africa 6275 (NWA 6275)


Found: 2009

Classification: Lunar meteorite (feldspathic breccia)

History: Reportedly found in Mauritania and purchased by Norbert Classen in February 2010 from a dealer in Agadir, Morocco.

Physical characteristics: Five small pale gray stones totaling 1.3 g.

Petrography: (A. Irving and S. Kuehner, UWS) Fine-grained recrystallized breccia composed of larger plagioclase grains poikilitically enclosing small grains (<100 μm) of pigeonite, subcalcic augite, olivine, Ti-chromite, ilmenite, troilite and metal.

Geochemistry: Olivine (Fa41.9-42.3, FeO/MnO = 81-89), plagioclase (An92.2-96.7Or0.3-<0.1), pigeonite (Fs31.0-32.0Wo11.5-14.1, FeO/MnO = 62-68), subcalcic augite (Fs19.3-19.6Wo37.1-36.9, FeO/MnO = 50-62). Bulk composition (R. Korotev, WUSL): FeO 3.3 wt%, Sc 7.1 ppm, Sm 0.40 ppm, Th 0.11 ppm.

Classification: Achondrite (lunar, granulitic feldspathic breccia). This meteorite has essentially the same texture, mineralogy and mineral compositions as NWA 3163, NWA 4483 and NWA 4881 (which are different portions of one naturally broken mass). The bulk composition of NWA 6275 is somewhat similar to that of the other specimens, although a little more felsic. Yet, given the fine scale mineralogical heterogeneity in all of these specimens, a pairing relationship among all of them seems likely.

Specimens: A 0.3 g polished piece is on deposit at UWS. Mr. N. Classen holds the remaining material (except for one stone consumed in bulk analyses).

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Mass (g):1.3
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):41.9-42.3
Ferrosilite (mol%):31.0-32.6; 19.3-19.6
Wollastonite (mol%):11.5-14.1; 37.1-36.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):0.3
Type spec location:UWS
Main mass:Classen
Comments:Submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Classen: Norbert Classen, Am Lindenplatz 1, 79356 Eichstetten, Germany; Website (private address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 193 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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