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Northwest Africa 13250
Basic information Name: Northwest Africa 13250
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13250
Observed fall: No
Year found: 2019
Country: Mauritania
Mass:help 2.57 kg
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Mar 2020
Writeup from MB 109:

Northwest Africa 13250 (NWA 13250)


Purchased: 2019 Dec

Classification: Martian meteorite (Shergottite)

History: Purchased from a Mauritanian meteorite (and desert truffle) hunter.

Physical characteristics: Single stone; saw cut reveals an ultramafic cumulate rock with ophitic to poikilitic textures with mm-size pale yellow and dark gray grains.

Petrography: (C. Agee, UNM) Microprobe examination shows approximately 50% olivine, 40% pyroxene, and 5-10% maskelynite. Two distinct pyroxene trends are present 1) Mg-rich low calcium pyroxene trending to slightly more Fe-rich pigeonite, 2) Mg-rich augite trending to diopsidic. Three distinct Cr-Fe spinel phases were detected throughout the sample, one with high TiO2 (~14 wt%), one with intermediate TiO2 (~7.5 wt%), and one with very low TiO2 concentrations. Ilmenite and Fe-sulfide are minor ubiquitous phases.

Geochemistry: (C. Agee, UNM) Olivine Fa34.3±2.4, Fe/Mn=50±3, n=7; low Ca-pyroxene Fs24.6±2.8Wo7.3±2.1, Fe/Mn=30±1, n=11; augite Fs15.8±1.1Wo38.5±5.6, Fe/Mn=25±1, n=5.

Classification: Martian peridotitic shergottite. Macroscopic textural appearance similar to NWA 1950 and ALHA77005.

Specimens: 22.7 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2019 Dec
Mass (g):2572
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):34.3±2.4
Ferrosilite (mol%):24.6±2.8, 15.8±1.1
Wollastonite (mol%):7.3±2.1, 38.5±5.6
Classifier:C. Agee, UNM
Type spec mass (g):22.7
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH487; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 202 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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