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Northwest Africa 13369
Basic information Name: Northwest Africa 13369
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13369
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 24.7 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 293 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Aug 2020
Writeup from MB 109:

Northwest Africa 13369 (NWA 13369)

Adrar, Algeria

Purchased: 2020

Classification: Martian meteorite (Shergottite)

History: The 24.7 g sample was found near Adrar and subsequently purchased in Tindouf. Fabien Kuntz purchased the sample in January of 2020.

Physical characteristics: The 24.7g sample is dark greenish-gray, crystalline and lacks fusion crust. The cut face shows the interior is composed of interlocking green crystals of pyroxene poikilitically enclosing black olivines (shock-darkened).

Petrography: Description and Classification: (A. Love, App) Sample has a poikilitic igneous texture composed of (vol%): 2.23 mm (avg. l.d., n=3) oikocrysts of pyroxene (~21.4) with 317 µm (avg. l.d., n=22) rounded chadacrysts of olivine. Oikocrysts are surrounded by 748µm (avg. l.d., n=20) euhedral prisms of olivine (~42.7); 913µm (avg. l.d., n=23); prismatic, twinned pyroxene (~45.7); and 488 µm (avg. l.d., n=23) lath-shaped maskelynite (~5.3). Additional minerals are merrillite, a Cl-apatite, chromite, ilmenite, titanomagnetite, pyrrhotite and secondary calcite.

Geochemistry: (A.Patchen-UTK) Olivine (Fa33.0±3.3, Mg#67.1±3.3, Fe/Mn=49.2±2.0, n=96); low-Ca pyroxene (Fs21.3±1.0Wo3.3±0.8, Fe/Mn=30.7±1.2 n=32); pigeonite (Fs27.9±2.7Wo10.2±2.7, Fe/Mn=28.8±3.4 n=131); subcalcic augite (Fs18.3±0.9Wo28.8±1.1, Fe/Mn=25.2±1.1, n=8) augite (Fs16.6±1.2Wo34.1±2.3, Fe/Mn=25.4±1.4 n=51); plagioclase (An52.0±4.6Or1.6±0.5, n=16).

Classification: Martian (poikilitic shergottite). Based on mineral compositions (Fs, Wo, Mg# and Fe/Mn) and textures, this sample is a highly shocked (U-S5) poikilitic shergottite.

Specimens: Kuntz holds the main mass. A polished thin section and a sliced fragment weighing 5.71 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2020
Mass (g):24.7
Class:Martian (shergottite)
Shock stage:U-S5
Weathering grade:moderate
Fayalite (mol%):33.0±3.3
Ferrosilite (mol%):21.3±1.0; 27.9±2.7; 16.6±1.2
Wollastonite (mol%):3.3±0.8; 10.2±2.7; 34.1±2.3
Magnetic suscept.:3.7
Classifier:A. Love, App
Type spec mass (g):5.71
Type spec location:App
Main mass:Kuntz
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 190 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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