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Northwest Africa 2640
Basic information Name: Northwest Africa 2640
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2640
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 342 g
Meteoritical Bulletin:  MB 106  (2018)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2858 approved meteorites (plus 2 unapproved names) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Mar 2017
Writeup from MB 106:

Northwest Africa 2640 (NWA 2640)

(Northwest Africa)

Purchased: 2004

Classification: Ordinary chondrite (LL6)

History: Purchased by Blaine Reed in 2004 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS; T. Bunch and J. Wittke, NAU) Rare chondrule remnants occur in a recrystallized matrix containing altered metal.

Geochemistry: Olivine (Fa30.5-31.6, N = 3), orthopyroxene (Fs24.7-25.1Wo2.0-2.4, N = 3), clinopyroxene (Fs9.4-10.0Wo43.8-43.7, N = 2).

Classification: Ordinary chondrite (LL6).

Specimens: 22.1 g including one polished endcut at PSF; remainder with Reed.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2004
Mass (g):342
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):30.5-31.6
Ferrosilite (mol%):24.7-25.1
Wollastonite (mol%):2.0-2.4
Classifier:A. Irving and S. Kuehne, UWSr; T. Bunch and J. Wittke, NAU
Type spec mass (g):22.1
Type spec location:PSF
Main mass:B. Reed
Comments:Work name BR8; submitted by A. Irving
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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