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Northwest Africa 7643
Basic information Name: Northwest Africa 7643
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7643
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 740 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Sep 2014
Writeup from MB 103:

Northwest Africa 7643 (NWA 7643)

(Northwest Africa)

Purchased: 2012 Dec

Classification: HED achondrite (Eucrite)

History: Purchased by DPitt in December 2012 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively coarse grained igneous aggregate of polycrystalline calcic plagioclase and exsolved pigeonite with accessory ilmenite and troilite. Not only has the plagioclase experienced moderate shock, the specimen is also cross-cut by dark brown, glassy shock melt veinlets.

Geochemistry: Host orthopyroxene (Fs59.9-60.6Wo2.1-2.4; FeO/MnO = 29-31), clinopyroxene exsolution lamellae (Fs26.3-26.7Wo42.8-42.7; FeO/MnO = 29).

Classification: Eucrite (unbrecciated, shocked).

Specimens: 29.1 g of material and one polished thin section are on deposit at UWB. DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2012 Dec
Mass (g):740
Shock stage:moderate
Weathering grade:low
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):29.1
Type spec location:UWB
Main mass:DPitt
Comments:D721; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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