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Northwest Africa 12425
Basic information Name: Northwest Africa 12425
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12425
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 1605 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 119 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Mar 2019
Writeup from MB 108:

Northwest Africa 12425 (NWA 12425)


Find: 2014 Jul

Classification: HED achondrite (Eucrite, unbrecciated)

History: Found by a shepherd in July 2014 near Oum el Assel, Algeria, and subsequently acquired by David Lehman in September 2018 from an Algerian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh unbrecciated specimen with microgabbroic texture composed of predominantly exsolved pigeonite and maskelynite with accessory silica polymorph, ilmenite, chromite, merrillite, troilite and Ni-free metal. Small patches and thin cross-cutting veinlets of dark shock glass are present. Most exsolved pigeonite consists of orthopyroxene host with clinopyroxene exsolution lamellae, but also present are grains composed of clinopyroxene host with orthopyroxene exsolution lamellae.

Geochemistry: Orthopyroxene host (Fs60.7-61.3Wo2.2-1.8, FeO/MnO = 31, N = 2), clinopyroxene exsolution lamellae (Fs26.3-29.8Wo43.8-39.8, FeO/MnO =29-30, N = 2), maskelynite (An89.9-90.0Or0.6-0.5, N = 2).

Classification: Eucrite (unbrecciated, microgabbroic, maskelynite-bearing).

Specimens: 25.1 g including one polished thin section at PSF; remainder with Mr. D. Lehman.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:2014 Jul
Mass (g):1604.6
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):60.7-61.3; 26.3-29.8
Wollastonite (mol%):2.2-1.8; 43.8-39.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):25.1
Type spec location:PSF
Main mass:D. Lehman
Comments:Work name DL18-1; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1208 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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