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Northwest Africa 15501
Basic information Name: Northwest Africa 15501
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15501
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 2.35 kg
Meteoritical Bulletin:  MB 112  (2023)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 133 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Jan 2023
Writeup from MB 112:

Northwest Africa 15501 (NWA 15501)

(Northwest Africa)

Purchased: 2022

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Nicholas Gessler in 2022 from Moroccan dealers.

Physical characteristics: Five very similar subangular stones (1012, 630, 220, 380, and 110 g) almost completely coated by thin semi-glossy, black fusion crust.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Thin sections of two stones (NG-EZ, NG-FR) were studied. Both exhibit identical unbrecciated subophitic, diabasic texture (mean grainsize ~0.5 mm) with mineralogy dominated by exsolved pigeonite and calcic plagioclase, together with accessory silica polymorph, ilmenite, Ti-chromite, troilite, Fe metal and rare zircon.

Geochemistry: Pigeonite hosts (Fs56.8-60.3Wo8.6-4.9, FeO/MnO = 30-35, N = 15), augite exsolution lamellae (Fs28.4-31.8Wo27.9-33.1, FeO/MnO = 30-34, N = 11), plagioclase (An85.5-88.5Or0.7-0.4, N = 15).

Classification: Eucrite (unbrecciated, diabasic).

Specimens: 47.5 g plus two polished thin sections at UWB; remainder with Mr. N. Gessler.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):2352
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):56.8-60.3; 28.4-31.8
Wollastonite (mol%):8.6-4.9; 27.9-33.1
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):26.1
Type spec location:UWB
Main mass:N. Gessler
Comments:Work names NG-EZ, NG-FR & NG-GP; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9559 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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