Meteoritical Bulletin: Entry for Northwest Africa 2640

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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: 342 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	LL6
Recommended:			LL6 [explanation]

This is 1 of 2930 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

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 (Fa_30.5-31.6, N = 3), orthopyroxene (Fs_24.7-25.1Wo_2.0-2.4, N = 3), clinopyroxene (Fs_9.4-10.0Wo_43.8-43.7, N = 2).

Classification: Ordinary chondrite (LL6).

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

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2004
Mass (g):	342
Pieces:	1
Class:	LL6
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

Institutions
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)

Catalogs:

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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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