Meteoritical Bulletin: Entry for Northwest Africa 13730

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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: 233 g

Classification
history:

Recommended:

Eucrite-unbr [explanation]

This is 1 of 131 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 6 Feb 2021

Writeup

help

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 (Fs_55.5-58.0Wo_3.2-4.7, FeO/MnO = 31-34, N = 3), augite exsolution lamellae (Fs_26.5-28.5Wo_42.1-40.8, FeO/MnO = 28-37, N = 3), submicrometer pigeonite lamella (Fs_43.5Wo_20.8, FeO/MnO = 35), maskelynite (An_78.2-88.0Or_2.3-0.5, 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:
  MB110
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2020 Sep
Mass (g):	233
Pieces:	1
Class:	Eucrite-unbr
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

Institutions
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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