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Northwest Africa 13730
Basic information Name: Northwest Africa 13730
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13730
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 233 g
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 6 Feb 2021
Writeup from MB 110:

Northwest Africa 13730 (NWA 13730)

(Northwest Africa)

Purchased: 2020 Sep

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Habib Naji in September 2020 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic igneous texture with domains of varying grainsize (0.2 to 1.6 mm). Composed predominantly of prismatic grains of exsolved pigeonite and lath-shaped grains of maskelynite together with accessory silica polymorph, ilmenite, chromite and troilite. There is significant dimensional preferred orientation of pyroxene and feldspar grains.

Geochemistry: Low-Ca pyroxene hosts (Fs55.5-58.0Wo3.2-4.7, FeO/MnO = 31-34, N = 3), augite exsolution lamellae (Fs26.5-28.5Wo42.1-40.8, FeO/MnO = 28-37, N = 3), submicrometer pigeonite lamella (Fs43.5Wo20.8, FeO/MnO = 35), maskelynite (An78.2-88.0Or2.3-0.5, N = 3).

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

Specimens: 22.1 g including one polished thin section at UWB; remainder with Mr. H. Naji.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020 Sep
Mass (g):233
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):55.5-58.0; 26.5-28.5
Wollastonite (mol%):3.2-4.7; 42.1-40.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.1
Type spec location:UWB
Main mass:H. Naji
Comments:Work name HN 777; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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