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Northwest Africa 7644
Basic information Name: Northwest Africa 7644
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7644
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 1337 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 127 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Sep 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7644 (NWA 7644)

(Northwest Africa)

Purchased: 2012 Dec

Classification: HED achondrite (Eucrite, unbrecciated)

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

Petrography: (A. Irving and S. Kuehner, UWS) Fresh unbrecciated, coarse grained, gabbroic assemblage of exsolved pigeonite, calcic plagioclase, silica polymorph, Ti-chromite, ilmenite and troilite.

Geochemistry: Host orthopyroxene (Fs57.2-57.3Wo5.4; FeO/MnO = 29-30), clinopyroxene exsolution lamellae (Fs28.5-28.9Wo41.2-40.7; FeO/MnO = 29).

Classification: Eucrite (gabbroic, unbrecciated).

Specimens: 20.5 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):1337
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):57.2-57.3; 28.5-28.9
Wollastonite (mol%):5.4; 41.2-40.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:DPitt
Comments:D722; 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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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