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Northwest Africa 7647
Basic information Name: Northwest Africa 7647
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7647
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 23.3 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 348 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Sep 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7647 (NWA 7647)

(Northwest Africa)

Purchased: 2012 Dec

Classification: HED achondrite (Eucrite, polymict)

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

Petrography: (A. Irving and S. Kuehner, UWS) Polymict fragmental breccia composed mainly of eucritic crystal debris with sparse lithic eucrite clasts (recrystallized to fine grained and very fine grained aggregates). Minerals include two different types of exsolved pigeonite, calcic plagioclase, silica polymorph, fayalite, Ti-chromite, ilmenite and rare kamacite.

Geochemistry: Pigeonite 1: host orthopyroxene (Fs59.3Wo4.3; FeO/MnO = 31), clinopyroxene exsolution lamellae (Fs26.6Wo43.0; FeO/MnO = 29). Pigeonite 2: host orthopyroxene (Fs38.9Wo2.2; FeO/MnO = 31), clinopyroxene exsolution lamellae (Fs14.8Wo44.4; FeO/MnO = 25).

Classification: Eucrite (polymict breccia).

Specimens: 4.7 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):23.3
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):see text
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.7
Type spec location:UWB
Main mass:DPitt
Comments:D725; 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 7377 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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