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Northwest Africa 14731
Basic information Name: Northwest Africa 14731
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14731
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 45 g
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 20 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 19 Mar 2022
Writeup from MB 111:

Northwest Africa 14731 (NWA 14731)

(Northwest Africa)

Purchased: 2019

Classification: Lunar meteorite (frag. breccia)

History: Purchased February, 2019 by anonymous collector from a Moroccan dealer

Physical characteristics: Many small identical looking stones mostly covered in caliche. No fusion crust present. Saw cut reveals a light and dark colored brecciated interior, with some vesicles and other melt features.

Petrography: (A Ross, UNM; D. Dickens, NMMS) This meteorite is a fragmental breccia of plagioclase, pyroxene, and olivine grains. Analysis of BSE images with ImageJ shows the major phases are plagioclase that has been converted to maskelynite being the dominant phase and equal parts pyroxene, olivine, and unconverted plagioclase being the other major phases. The minor phases include kamacite, ilmenite, and troilite. Some Cr-spinels with Mg+Al+Ti were detected.

Geochemistry: (A. Ross, UNM) olivine Fa: 29.2±7.1, Fe/Mn=95±7, n=10; clinopyroxene Fs27.2±5.9Wo8.3±2.0, Fe/Mn=54±4, n=8; plagioclase An96.7±0.3, n=6;

Classification: Lunar fragmental breccia

Specimens: 9 g including a probe mount on deposit at UNM, anonymous collector holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, Arizona
Date:P 2019
Mass (g):45 g
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):29.2±7.1
Ferrosilite (mol%):27.2±5.9
Wollastonite (mol%):8.3±2.0
Classifier:D. Dickens, NMMS; C. Agee, UNM
Type spec mass (g):9g
Type spec location:UNM
Main mass:Anonymous
Comments:Field name DD77; submitted by D. Dickens
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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