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Northwest Africa 13181
Basic information Name: Northwest Africa 13181
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13181
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 31 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 173 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13181 (NWA 13181)

(Northwest Africa)

Purchased: 2019 Jun

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Laurent Combaud in June 2019 from a dealer in Tagounite, Morocco on behalf of a jewelry store in Nice, France.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of equigranular clasts in a finer grained matrix. The clasts are composed predominantly of exsolved pigeonite and calcic plagioclase together with accessory silica polymorph, Ti chromite, ilmenite, troilite, zircon and merrillite. Although the majority of the plagioclase is very calcic (bytownite), more sodic and potassic plagioclase is present in one region of the studied stone.

Geochemistry: Low-Ca pyroxene host (Fs52.9-57.1Wo2.4-3.8, FeO/MnO = 34-38, N = 6), high-Ca pyroxene exsolution lamellae (Fs26.9-29.3Wo38.6-42.1, FeO/MnO = 32-37, N = 4), subcalcic augite grain (Fs34.3Wo32.6, FeO/MnO = 34), augite in matrix (Fs20.0Wo45.8, FeO/MnO = 32), pigeonite in matrix (Fs54.8Wo7.7, FeO/MnO = 33), calcic plagioclase (An78.4-86.0Or1.5-0.7, N = 3), more sodic and potassic plagioclase (An73.6Or9.4).

Classification: Eucrite (breccia).

Specimens: 6.2 g including a polished mount at UWB; remainder with Akuadra Bijoux et Météorites, Nice, France.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tagounite
Date:P 2019 Jun
Mass (g):31
Pieces:several
Class:Eucrite-br
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):52.9-57.1; 26.9-29.3
Wollastonite (mol%):2.4-3.8; 38.6-42.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):6.2
Type spec location:UWB
Main mass:Akuadra Bijoux et Météorites
Comments:Work name GSP; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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