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Northwest Africa 15632
Basic information Name: Northwest Africa 15632
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15632
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 64.7 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 75 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Mar 2023
Writeup from MB 112:

Northwest Africa 15632 (NWA 15632)

(Northwest Africa)

Purchased: 2022 Jul

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Shun-Chung Yang in July 2022 from a dealer in Legazpia, Spain, who had obtained the material from a Moroccan source.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia consisting of relatively closely-packed lithic clasts (all with fine-intergranular textures) within a fairly sparse (overall ~5 vol.%) melt-textured, partly glassy matrix containing quenchiform crystals of pigeonite and troilite. Some lithic clasts are surrounded by cloudy apparent reaction zones against the matrix. Minerals in the clasts include exsolved pigeonite, unexsolved pigeonite, calcic plagioclase (mostly very finely polycrystalline but some apparently converted to maskelynite), silica polymorph, low-Ti chromite, high-Ti chromite, merrillite, troilite, Fe metal, ilmenite and rare zircon, plus minor secondary calcite, barite and Fe oxides.

Geochemistry: Low-Ca pyroxene (Fs58.7-62.3Wo4.7-2.0, FeO/MnO = 30-33, N = 6), pigeonite (Fs54.0-59.3Wo9.7-5.3, FeO/MnO = 30-34, N = 4), subcalcic augite (Fs38.7Wo28.9, FeO/MnO = 30), augite (Fs26.7-29.3Wo43.6-41.3, FeO/MnO = 31-36, N = 7), plagioclase (An88.9-89.7Or0.6-0.4, N = 3).

Classification: Eucrite (monomict melt matrix breccia).

Specimens: 13.4 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  Table 0
  Line 0:
Place of purchase:Legazpia, Spain
Date:P 2022 Jul
Mass (g):64.7
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):58.7-62.3; 26.7-29.3
Wollastonite (mol%):4.7-2.0; 43.6-41.6
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):13.4
Type spec location:UWB
Main mass:S.-C. Yang
Comments:Work name SCY-83; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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