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Northwest Africa 14243
Basic information Name: Northwest Africa 14243
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14243
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 3.28 kg
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 31 Oct 2021
Writeup from MB 110:

Northwest Africa 14243 (NWA 14243)

(Northwest Africa)

Purchased: 2019

Classification: Martian meteorite (Shergottite)

History: 3 brownish stone pieces weighing 3280 g (1511+1050+719 g) were found in Mauritania and purchased in 2019-2021 from a Mauritanian dealer Aziz Moudani by a private anonymous collector.

Physical characteristics: Three elongated greenish brownish pieces of stone with almost no crust: 165 × 73 × 75 mm piece weighing 1511 g, 110 × 90 × 67 mm piece weighing 1050 g, and 130 × 5 0x 40 mm weighing 719 g. The interior consists of light brownish-gray, finer-grained matrix.

Petrography: (A. Abdrakhimov, Vernad) Diabasic texture (mean grainsize 0.2-1 mm). In transmitted light, a thin section is seen to be a fine-grained basalt, composed of subhedral grains of clinopyroxene interspersed with almost equal amounts of clear, transparent feldspathic glass (maskelynite) (0.2-1 mm). The analyzed sample contains 50 vol% complexly-zoned Ca-pyroxene (pigeonite and augite), 45 vol% plagioclase (maskelynite) with accessory titanomagnetite (0.1-0.3 mm), ilmenite (~0.1 mm), merrillite (~0.005 mm), chlorapatite(~0.005 mm), pyrrhotite(~0.005 mm), K-Si-rich glasses and orthoclase are also present. Pockets (~0.7 mm) of myrmekitic intergrowths of silica polymorph and sodic plagioclase are associated with maskelynite.

Geochemistry: Mineral compositions and geochemistry: (A. Abdrakhimov, Vernad, SEM/EDS) Subcalcic augite Fs31.72 (Fs19.68-43.75, N=18) (Fs19.68-43.75Wo36.11-22.32, FeO/MnO = 23.99-36.74, N=18), ferropigeonite Fs48.56 (Fs32.58-64.53, N=21) (Fs32.58-64.53 Wo10.2-15.88, FeO/MnO = 28.56-36.56, N=21), large maskelynite grains (Ab43.3-48.3Or3.4-2.2, N=6), plagioclase in intergrowth with silica polymorph (Ab59.8-58Or6.3-6.4 N=2).

Classification: Shergottite (aphyric, diabasic). Sample shows a high level of shock and low level of weathering.

Specimens: Total original mass of 3 samples was 3280 g. Type specimen mass is 106.39 g, includes two polished thin section at Vernad remainder held by DMUH.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):3280
Class:Martian (shergottite)
Weathering grade:W1
Ferrosilite (mol%):48.56±22.59
Wollastonite (mol%):13.04±4.02
Classifier:A. Abdrakhimov, C. Lorenz, Vernad
Type spec mass (g):106.389
Type spec location:Vernad
Main mass:3280
Comments:Submitted by A.Abdrakhimov, Vernad
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
DMUH: Dedovsk Museum of Universe History, Russia; Website (institutional address; updated 26 Sep 2011)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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