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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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8746 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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