Meteoritical Bulletin: Entry for Northwest Africa 7642

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Northwest Africa 7642

Basic information

Name: Northwest Africa 7642
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7642
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 180.3 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 8 Nov 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 7642 (NWA 7642)

(Northwest Africa)

Purchased: 2012 Dec

Classification: HED achondrite (Eucrite, monomict)

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

Petrography: (A. Irving and S. Kuehner, UWS) Apparently monomict breccia composed of basaltic eucrite clasts plus related crystal debris. Lithic clasts exhibit variable degree of recrystallization, with finer grained domains. Minerals are orthopyroxene, discrete subcalcic augite, pigeonite, calcic plagioclase, silica polymorph, ilmenite, troilite, Ni-free metal, and rare zircon.

Geochemistry: Orthopyroxene (core Fs_45.1Wo_1.7, FeO/MnO = 36; rim Fs_54.1-54.3Wo_2.7-4.3, FeO/MnO = 31-34), subcalcic augite (Fs_27.7-28.7Wo_39.3-36.7, FeO/MnO = 29-32), pigeonite (Fs_41.9Wo_21.9, FeO/MnO = 32).

Classification: Eucrite (monomict breccia).

Specimens: 22.3 g of material and one polished thin section are on deposit at UWB. DPitt holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2012 Dec
Mass (g):	180.3
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	low
Weathering grade:	low
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.3
Type spec location:	UWB
Main mass:	DPitt
Comments:	D720; submitted by A. Irving

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)
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)

Catalogs:

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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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