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Northwest Africa 13861
Basic information Name: Northwest Africa 13861
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13861
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 130 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 51 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13861 (NWA 13861)

(Northwest Africa)

Purchased: 2020 Sep

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased in September 2020 by Juan Avil├ęs Poblador on behalf of UAlic from a dealer in Chinguetti, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of lithic eucrite clasts (exhibiting intergranular textures and variable fine to medium grainsize) within a sparse matrix consisting of dark glass (sepia brown in thin section with "swirly" texture) plus engulfed eucritic crystalline debris. Major minerals are exsolved pigeonite and calcic plagioclase accompanied by accessory silica polymorph, Na-free merrillite, ilmenite, troilite, Ti-chromite, low-Ti chromite and zircon. In spite of the presence of quenched melt matrix, the plagioclase does not show optical evidence of extensive shock.

Geochemistry: Low-Ca pyroxene (Fs63.0-65.1Wo1.8-2.0, FeO/MnO = 29-33, N = 5), augite (Fs27.4-29.4Wo42.4-43.8, FeO/MnO = 29-33, N = 5), plagioclase (An86.4-91.6Or1.7-0.2, N = 5).

Classification: Eucrite (melt matrix breccia).

Specimens: 20.9 g including one polished thin section at UWB; remainder in the collection of UAlic.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Chinguetti, Mauritania
Date:P 2020 Sep
Mass (g):130
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):63.0-65.1; 27.4-29.4
Wollastonite (mol%):1.8-2.0; 42.4-43.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.9
Type spec location:UWB
Main mass:J. Poblador
Comments:Work name JAP20-4; 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)
UAlic: Earth Sciences Department University of Alicante San Vicente del Raspeig, Spain (institutional address; updated 9 Feb 2020)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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