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Northwest Africa 12513
Basic information Name: Northwest Africa 12513
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12513
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 2.55 kg
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 224 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 12 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12513 (NWA 12513)

(Northwest Africa)

Purchased: 2018 Aug

Classification: HED achondrite (Eucrite, monomict)

History: Four similar stones (total 2545 g) were recovered ~50 m apart at a location in Algeria, and were purchased by Mbark Arjdal in August 2018 from an Algerian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh monomict gabbroic eucrite specimen composed of coarse grained lithic clasts in a sparse matrix of related crystalline debris. Major minerals are low-Ca pyroxene and calcic plagioclase together with accessory silica polymorph and ilmenite (associated with multiple small grains of zircon). Some pyroxene has unexsolved pigeonite cores whereas other pyroxenes have exsolved into augite lamellae within host orthopyroxene.

Geochemistry: Low-Ca pyroxene cores (Fs31.9-32.1Wo6.2-5.6, FeO/MnO = 29, N = 2), orthopyroxene host (Fs60.6Wo4.5, FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs26.2-29.1Wo43.7-40.6, FeO/MnO = 31-35, N = 2), plagioclase (An84.3-87.9Or1.5-0.7, N = 2).

Classification: Eucrite (monomict breccia, gabbroic).

Specimens: 33.5 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2018 Aug
Mass (g):2545
Pieces:4
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):31.9-32.1; 60.6
Wollastonite (mol%):6.2-5.6; 4.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):33.5
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj18-B19; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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