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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:help 180.3 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 230 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Nov 2014
Writeuphelp
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 Fs45.1Wo1.7, FeO/MnO = 36; rim Fs54.1-54.3Wo2.7-4.3, FeO/MnO = 31-34), subcalcic augite (Fs27.7-28.7Wo39.3-36.7, FeO/MnO = 29-32), pigeonite (Fs41.9Wo21.9, 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
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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