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Northwest Africa 13426
Basic information Name: Northwest Africa 13426
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13426
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 137.3 g
Meteoritical Bulletin:  MB 109  (2020)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 106 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 19 Sep 2020
Writeup from MB 109:

Northwest Africa 13426 (NWA 13426)

(Northwest Africa)

Purchased: 2020

Classification: Lunar meteorite

History: Many stones totaling 137.3 g were found and subsequently purchased from a meteorite prospector in Tindouf, Algeria, in March, 2020.

Physical characteristics: Samples are coated with a layer of light-orange caliche, and have a dark-colored interior containing clastic crystalline debris.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of rounded to angular 25.1-2241 μm (avg. length 272 μm, n=145) mineral grains and lithic clasts with poikilitic, basaltic and brecciated textures set within a melt matrix. Sample contains clear glassy spheres, fragments and glassy schlieren textured objects. Additional minerals are FeNi grains, a silica polymorph, chromite, ilmenite, titanomagnetite and troilite.

Geochemistry: (A. Love, App) Olivine Fa30.1±10.0 (Fa19.7-40.5, Fe/Mn=80.3±6.2, n=8); low-Ca pyroxene Fs21.2±2.5Wo3.2±0.2 (Fs19.5-23.0Wo3.1-3.4, Fe/Mn=48.8±1.3, n=2); pigeonite Fs32.4±4.9Wo11.6±3.9 (Fs23.0-37.7Wo5.9-18.0, Fe/Mn=51.9±2.8, n=5); high-Ca pyroxene Fs29.1±7.7Wo29.7±4.0 (Fs21.4-38.4Wo21.8-32.1, Fe/Mn=54.0±5.9, n=6); plagioclase An96.4±0.9Or0.2±0.2 (n=7).

Classification: Lunar (feldspathic breccia). Based on textures, melt matrix component and mineral compositions, this sample is a feldspathic breccia.

Specimens: Kuntz holds the main masses. A polished thin section and 10 fragments weighing 21.53 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2020
Mass (g):137.3
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):30.1±10.0
Ferrosilite (mol%):21.2±2.5; 32.4±4.9; 29.1±7.7
Wollastonite (mol%):3.2±0.2; 11.6±3.9; 29.7±4.0
Classifier:A. Love, App
Type spec mass (g):21.53
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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