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Northwest Africa 8317
Basic information Name: Northwest Africa 8317
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8317
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 383 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 25 Nov 2014
Writeup from MB 103:

Northwest Africa 8317 (NWA 8317)

(Northwest Africa)

Purchased: 2014 Jan

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased from a Moroccan dealer in New York City in January 2014 by Darryl Pitt.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of both gabbroic and basaltic-textured eucrite clasts plus related mineral debris. The pyroxenes in all textural components have a distinctive pinkish clove brown color, suggesting that this is a genomict breccia. Minerals are exsolved pigeonite (unusually ferroan), calcic plagioclase, silica polymorph, ilmenite and troilite.

Geochemistry: Host orthopyroxene (Fs63.8-64.2Wo2.0-2.2; FeO/MnO = 32-35), clinopyroxene exsolution lamellae (Fs27.5-27.8Wo43.6-43.1; FeO/MnO = 30-31).

Classification: Eucrite, genomict breccia. Pyroxene in this specimen is unusually ferroan.

Specimens: 20.1 g including one polished thin section at UWB. The remaining material is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:New York City
Date:P 2014 Jan
Mass (g):383
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):63.8-64.2; 27.5-27.8
Wollastonite (mol%):2.0-2.2; 43.6-43.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:D. Pitt
Comments:MAC0013; submitted by A. Irving
   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)
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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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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