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Northwest Africa 13366
Basic information Name: Northwest Africa 13366
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13366
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 417 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 269 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Aug 2020
Writeup from MB 109:

Northwest Africa 13366 (NWA 13366)


Purchased: 2019

Classification: Martian meteorite (Shergottite)

History: Purchased from a nomad in Algeria in 2019 and sent to Dustin Dickens at the Tucson Gem and Mineral Show, February 2020.

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 60% olivine, 35% pyroxene, and 5% 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 more Ca-rich augite. Ilmenite, Fe-sulfide, and merrillite are minor ubiquitous phases.

Geochemistry: (C. Agee, UNM) Olivine Fa34.5±2.6, Fe/Mn=50±3, n=15; low Ca-pyroxene Fs24.4±4.6Wo5.9±3.8, Fe/Mn=30±2, n=9; augite Fs16.0±1.2Wo35.0±3.1, Fe/Mn=24±1, n=4; maskelynite An53.7±1.1Ab44.9±1.2Or1.4±0.1, n=6.

Classification: Martian peridotitic shergottite. Macroscopic textural appearance similar to NWA 1950 and ALHA77005. Paired with NWA 13250.

Specimens: 20 g on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2019
Mass (g):417
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):34.5±2.6
Ferrosilite (mol%):24.4±4.6, 16.0±1.2
Wollastonite (mol%):5.9±3.8, 35.0±3.1
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-65; 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 1167 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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