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Northwest Africa 13219
Basic information Name: Northwest Africa 13219
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13219
Observed fall: No
Year found: 2019
Country: Niger
Mass:help 113 g
Classification
  history:
Recommended:  Eucrite-cm    [explanation]

This is 1 of 47 approved meteorites classified as Eucrite-cm.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13219 (NWA 13219)

Niger

Purchased: 2019 August

Classification: HED achondrite (Eucrite, cumulate)

History: Purchased over the Internet from anonymous finder; said to be from Niger; shipped from Mauritania.

Physical characteristics: A nearly-whole, oriented individual stone covered 90% in a dark-brown and spotted fusion-crust which has flow-lines and over-lipping. The fusion crust has a distinctive, locally translucent appearance, with "spots" where the fusion crust is clear (dependent upon the minerals in the underlying stone).

Petrography: This highly shocked breccia consists dominantly of pyroxene and plagioclase (now partly maskelynite). Vaguely discernible vestiges of the original texture suggest grains up to 3.5 mm (plagioclase) but conceivably even coarser; most of the material has been granulated to <<1 mm. Accessory phases include Cr-spinel, Fe-metal, troilite, and a glassy shock-melt vein. Within a few relatively ungranulated pyroxene grains, exsolved augite lamellae are seen to be about 5-8 µm wide. Classification as a cumulate eucrite is based on geochemistry (see below), not the severely impact-modified texture.

Geochemistry: Low-Ca pyroxene (10 analyses) clusters near Fs36.4Wo4.3. High-Ca pyroxene blebs and lamellae (3 analyses) cluster near Fs18.6Wo37.9. Pyroxene FeO/MnO (wt; 14 analyses) averages 28.2. Plagioclase (8 analyses) is An92.3-95.3, average An93.9±1.0. Classification as a cumulate eucrite is based on geochemistry (magnesian mafic silicates, Na-poor plagiolcase, little if any ilmenite), not texture. Analyses (2) of a glassy shock-melt vein average 18.0 wt% Al2O3 with FeO/MgO (wt) = 1.09.

Classification: Eucrite, cumulate, brecciated.

Specimens: 24 grams at UCLA; main mass with Verish.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mailed from Mauritania
Date:P 2019 August
Mass (g):113
Pieces:1
Class:Eucrite-cm
Shock stage:High
Weathering grade:moderate
Ferrosilite (mol%):36.4±0.7 (low-Ca)
Wollastonite (mol%):4.3±0.5 (low-Ca)
Classifier:P Warren, UCLA
Type spec mass (g):24.3
Type spec location:UCLA
Main mass:Robert Verish
Comments:Verish's address: R. Verish, Meteorite-Recovery Lab, P.O. Box 463084, Escondido, CA 92046; submitted by Paul Warren
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Verish: Robert Verish, Meteorite-Recovery Lab, P.O. Box 463084, Escondido, CA 92046, United States; Website (private address; updated 27 May 2009)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Paul Warren            
Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 69 approved meteorites from Niger (plus 4 unapproved names)

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