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Northwest Africa 13217
Basic information Name: Northwest Africa 13217
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13217
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 50 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 5 Apr 2020
Writeup from MB 109:

Northwest Africa 13217 (NWA 13217)

Northwest Africa

Purchased: 2019

Classification: Martian meteorite (Shergottite)

History: Purchased from Morocco May 2019.

Physical characteristics: Five identical appearing pieces. No fusion crust, desert weathered exteriors. Saw cuts reveal fine-grained pyroxene grains and shiny maskelynite. Numerous black shock melt pockets present.

Petrography: (C. Agee, UNM) EPMA images show ~60% igneous-zoned pyroxene and 35% maskelynite. Ubiquitous Ti-magnetite, ilmenite, sulfide, and shock melt observed.

Geochemistry: (C. Agee, UNM) Pigeonite Fs57.7±2.8Wo15.1±3.2, Fe/Mn=37±1, n=6; augite Fs27.8±9.8Wo33.0±2.5, Fe/Mn=30±3, n=6; plagioclase An49.3±3.5, Ab49.3±3.1, Or 1.5±0.5, n=6; shock melt (proxy for bulk composition) SiO2=48.4, TiO2=1.3, Al2O3=7.2, MgO=7.0, FeO=21.0, MnO=0.55, CaO=9.9, Na2O=1.4, K2O=0.17 (wt%), n=4.

Classification: Martian basaltic shergottite.

Specimens: 11 g on deposit at UNM, Larry Atkins holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):50
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):57.7±2.8; 27.8±9.8
Wollastonite (mol%):15.1±3.2; 33.0±2.5
Classifier:C. Agee, UNM
Type spec mass (g):11
Type spec location:UNM
Main mass:Larry Atkins
Comments:Field name LA-102; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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