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Northwest Africa 14185
Basic information Name: Northwest Africa 14185
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14185
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1900 g
Recommended:  Aubrite    [explanation]

This is 1 of 78 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 6 Oct 2021
Writeup from MB 110:

Northwest Africa 14185 (NWA 14185)

(Northwest Africa)

Purchased: 2021 Jul

Classification: Enstatite achondrite (Aubrite)

History: The meteorite was purchased from a dealer in Algeria.

Physical characteristics: White-grayish fragments with minor fusion crust and fine black shock melt veins exposed at the suface. Several orange-brownish stained areas sometimes with silvery metal grains are visible.

Petrography: The meteorite is a breccia predominantly composed of up to 1.5 cm sized enstatite grains with fine diopside exsolutions and several up to 5 mm sized twinned diopside grains that contain abundant enstatite exsolution lamellae. Rims of larger diopsides are often devoid of exsolutions. Opaque phases include Ti-bearing troilite, daubréelite, alabandite, brezinaite, schreibersite, and Si-bearing kamacite. The meteorite is highly shocked, i.e., enstatite shows several sets of planar fractures, diopside and enstatite shock strong undulatory extinction, and it contains abundant thin black shock melt veins and pockets. Neither forsterite nor plagioclase have been found in the two sections studied. No relict chondrules were observed.

Geochemistry: enstatite: Fs0.04±0.06Wo0.8±0.1 (Fs0.00-0.20Wo0.7-0.9, n=27); diopside exsolution lamellae: Fs0.00Wo44.5-45.9, n=3); diopside: Fs0.01±0.03Wo45.4±0.2 (Fs0.00-0.10Wo44.9-45.9, n=12); enstatite exsolution lamellae: Fs0.03±0.05Wo1.5±0.7 (Fs0.00-0.10Wo0.6-2.4, n=10); diopside exsolution-free rim: Fs0.02±0.04Wo48.1±0.1 (Fs0.00-0.10Wo47.9-48.3, n=5); troilite (Ti = 2.7 wt.%); kamacite (Si = 1.1 wt.%)

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Jul
Mass (g):1900
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):0.04; 0.01; 0.03; 0.02
Wollastonite (mol%):0.8; 45.4; 1.5; 48.1
Classifier:A. Greshake, MNB
Type spec mass (g):24.1
Type spec location:MNB
Main mass:Hanno Strufe and Ismaily Sidi Mohamed
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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