Meteoritical Bulletin: Entry for Northwest Africa 7881

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Northwest Africa 7881

Basic information

Name: Northwest Africa 7881
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7881
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 357 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 27 Jul 2013

Writeup

Writeup from MB 102:

Northwest Africa 7881 (NWA 7881)

(Northwest Africa)

Purchased: 2012 Oct

Classification: HED achondrite (Eucrite)

History: Purchased by F. Kuntz in October 2012 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh, fragmental genomict breccia composed of clasts with basaltic to diabasic textures and related crystal debris. All components contain similar distinctive, pale brown exsolved pigeonite. Other constituent minerals are calcic plagioclase,

Geochemistry: Orthopyroxene host (Fs_69.2-72.0Wo_1.9-1.7; FeO/MnO = 31-32), clinopyroxene exsolution lamellae (Fs_31.2-32.2Wo_45.0-42.6; FeO/MnO = 32-33).

Classification: Eucrite (genomict breccia, ferroan). All the pyroxenes in this specimen are compositionally similar and distinctly ferroan by comparison with typical eucrites.

Specimens: Type specimen plus one polished thick section on deposit with PSF; main mass with Kuntz.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P 2012 Oct
Mass (g):	357
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	69.2-72.0
Wollastonite (mol%):	1.9-1.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.83
Type spec location:	PSF
Main mass:	F. Kuntz
Comments:	K 197; submitted by P. Sipiera

Institutions
and collections

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)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Franco Vignato
Mike Markowitz

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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