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Northwest Africa 2200
Basic information Name: Northwest Africa 2200
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2200
Observed fall: No
Year found: 2004
Country: Morocco
Mass:help 552 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Lunar (feldspathic breccia)
Recommended:  Lunar    [explanation]

This is 1 of 83 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 25 Jun 2005
Writeuphelp
Writeup from MB 90:

Northwest Africa 2200

Morocco

Find: August 2004

Achondrite: (lunar, feldspathic breccia)

History: A completely crusted, 552 g, ellipsoidal stone was found in the Atlas Mountains, Morocco, and purchased in Erfoud by a Moroccan dealer for D. Gregory in August 2004.

Petrography and Geochemistry: (S. Kuehner and A. Irving, UWS) Breccia consisting of coarse, greyish-to-whitish lithic and mineral clasts in a darker glassy-to-finely crystalline matrix. Lithic clasts are mainly very fine-grained, quench-textured, feldspathic rocks that probably result from impact melting of anorthositic to gabbroic anorthositic precursors. A small percentage of the clasts are ophitic-textured mare basalts. Mineral clasts include anorthitic plagioclase, olivine (Fa30–60), exsolved pigeonite, irregular grains of metal (Ni = 10–45 wt%), Ti-rich chromite, Ti-poor chromite, pyroxene-like glass, schreibersite (Ni = 5 wt%), clinopyroxene, ilmenite, troilite, and rare zirconolite. Clinopyroxene and orthopyroxene grains in mineral and lithic clasts have Fe/ (Fe+Mg) = 0.258–0.482 with Ti/(Ti+Cr) = 0.53–0.75. FeO/ MnO ratios measured for olivine (99.7, 105.5), clinopyroxene (73.7), and orthopyroxene (65.4) are unmistakably within the ranges for these minerals in known lunar rocks. Feldspar grains in mineral and lithic clasts have a narrow compositional range of An95.8–97.4.

Classification: Achondrite (lunar, feldspathic breccia).

Specimens: A 20.5 g type specimen, one polished thin section, and one polished mount are on deposit at UWS. D. Gregory holds the main mass.

Data from:
  MB90
  Table 2
  Line 15:
Place of purchase:Morocco
Date:Aug 2004
Mass (g):552
Pieces:1
Class:Lunar
Type spec mass (g):20.5
Institutions
   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)
Gregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
David Gregory      
Mike Farmer   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Doug R   
Jim Strope   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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