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Northwest Africa 11673
Basic information Name: Northwest Africa 11673
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11673
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 212 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 215 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 31 Mar 2019
Writeup from MB 108:

Northwest Africa 11673 (NWA 11673)

(Northwest Africa)

Purchased: 2017 Nov

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Darryl Pitt in November 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of a variety of lithic clasts and related debris in a finer grained matrix. Eucrite clasts exhibit diverse textures (including subophitic, microgabbroic and gabbroic). Other minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, Ti-chromite, chromite and troilite. Except in one gabbroic eucrite clast in the studied thin section (where the plagioclase is birefringent with strongly undulose extinction), all of the plagioclase in this specimen has been transformed almost entirely to maskelynite (although very minor birefringent domains are present in places).

Geochemistry: Orthopyroxene host (Fs56.6-58.7Wo3.0-2.5, FeO/MnO = 30-33, N = 3), clinopyroxene exsolution lamellae (Fs26.4-27.4Wo41.5-40.7, FeO/MnO = 33-35, N = 2), plagioclase (An88.5-92.2Or0.7-0.4, N = 4).

Classification: Eucrite (genomict breccia, shocked).

Specimens: 22.5 g including one polished thin section at UWB; main mass with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Nov
Mass (g):212.3
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):58.4-58.7; 26.4-27.4
Wollastonite (mol%):3.0-2.8; 41.5-40.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.5
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 323; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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