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Northwest Africa 13223
Basic information Name: Northwest Africa 13223
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13223
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 638 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 240 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13223 (NWA 13223)

(Northwest Africa)

Purchased: 2019 Nov

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Aziz Habibi in November 2019 from a Malian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of large diabasic eucrite clasts (mean grainsize 0.5 mm) with sparse regions of polygranular matrix and cross-cutting granulated zones. Major minerals are zoned pyroxenes (consisting of low-Ca pyroxene cores and rims of pigeonite with patchy, dark pyroxferroite) and lath-like calcic plagioclase (converted completely to maskelynite), together with accessory silica polymorph, ilmenite, troilite, Ni-free metal, and baddeleyite. Minor thin veinlets of secondary calcite and small grains of barite are present.

Geochemistry: Low-Ca pyroxene cores (Fs35.7-47.1Wo7.5-11.8, FeO/MnO = 27-28, N = 4), pigeonite rims (Fs44.0-66.6Wo18.6-21.7, FeO/MnO = 28-36, N = 4), subcalcic augite (Fs46.6-56.7Wo29.6-25.6, FeO/MnO = 32-36, N = 2), pyroxferroite (Fs77.6Wo15.7, FeO/MnO = 19), fayalite (Fa92.6-96.2, FeO/MnO = 43-46, N = 2), maskelynite (An87.6-89.0Or0.4-0.5, N = 3).

Classification: Eucrite (monomict breccia, diabasic, highly shocked, maskelynite-bearing).

Specimens: 20.0 g including one polished thin section at UWB; remainder with Mr. A. Habibi.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2019 Nov
Mass (g):638
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:low
Fayalite (mol%):92.6-96.2
Ferrosilite (mol%):35.7-47.1; 44.0-66.6; 46.6-56.7
Wollastonite (mol%):7.5-11.8; 18.6-21.7; 29.6-25.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.0
Type spec location:UWB
Main mass:A. Habibi
Comments:Work name AH 727; 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 7472 approved meteorites from (Northwest Africa) (plus 1988 unapproved names)

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