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Northwest Africa 7183
Basic information Name: Northwest Africa 7183
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7183
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 175 g
Meteoritical Bulletin:  MB 102  (2013)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 60 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 7183 (NWA 7183)

(Northwest Africa)

Purchased: 2007 Sep

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Twelker in 2007 September from a Moroccan dealer at the Denver Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh fragmental breccia consisting predominantly of angular diogenitic orthopyroxene grains (up to 2 mm across) plus <10 vol.% basaltic eucrite clasts and one finer-grained fragmental breccia clast. Minerals are orthopyroxene, exsolved pigeonite, calcic plagioclase, chromite, ilmenite and troilite.

Geochemistry: Orthopyroxene (Fs17.1Wo1.1; Fs26.8Wo2.6; FeO/MnO = 27-30) , exsolved pigeonite (orthopyroxene host Fs49.7±0.0Wo1.8-4.0, FeO/MnO = 32-33; clinopyroxene lamellae Fs25.5-28.7Wo39.6-38.5, FeO/MnO = 27).

Classification: Polymict diogenite.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2007 Sep
Mass (g):175
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):17.1; 26.8; 49.7±0.0; 25.5-28.7
Wollastonite (mol%):1.1; 2.6; 1.8-4.0; 39.6-38.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWB
Main mass:E. Twelker
Comments:ET07-1; 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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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