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Northwest Africa 15432
Basic information Name: Northwest Africa 15432
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15432
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 16 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Lunar (melt breccia)
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 28 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15432 (NWA 15432)

(Northwest Africa)

Purchased: Sep 2021

Classification: Lunar meteorite (melt breccia)

History: Meteorite was purchased by Mr. Jasper Spencer from a Mauritanian dealer in September 2021 via Facebook Messenger, who said it was found in Algeria in 2021. Mr. Spencer sent a 4 g end piece to Cascadia for classification.

Physical characteristics: Physical Characteristics: The cut face shows small (< 1mm across) angular light-colored to white clasts set in a black background; only two rectangular clasts exceed 1mm across (both are ~1.5 × 0.75 mm in exposed area).

Petrography: (M. Hutson and A. Ruzicka, Cascadia): Sample is a melt breccia consisting of sub-angular to sub-rounded lithic, mineral and glass clasts set in a glassy matrix. Clasts are dominated by anorthitic feldspar; the largest (~1.5 × 0.75 mm) is a noritic anorthosite (Stoeffler et al., 1980). One clast (~0.7 × 0.5 mm in exposed area) is composed of anorthitic feldspar, orthopyroxene, clinopyroxene, and olivine in the proportions described by Stoffler et al. (1980) as an anorthositic norite, but ~5% of the clast is comprised of coarse (50-100 µm across) irregularly-shaped troilite. Other accessory phases include Cr- and Al-rich spinel grains, SiO2, FeNi metal, and ilmenite.

Geochemistry: Plagioclase feldspar: Ab3.2±0.7Or0.5±0.1An96.2±0.8, N=19. Olivine grains within clasts were relatively uniform, but varied from clast to clast (Fa28-41). Mg-rich olivine grains (Fa6.2-7.5) were observed as individual grains between clasts. Average of all olivine grains: Fa27.9±14.3, Fe/Mn=92.0±9.3, N=13. Low-Ca pyroxene: Fs32.4±0.8Wo3.4±0.5, Fe/Mn=59.2±6.0, N=6; Pigeonite: Fs34.9±11.7Wo9.4±3.7, N=16; Augite: Fs22.9±5.3Wo31.3±6.1, N=9.

Classification: Lunar (melt breccia). This meteorite is best described as a lunar feldspathic melt breccia based on texture and chemistry.

Specimens: Cascadia holds 2.6 g in one piece, as well as a polished thin section and material in an epoxy butt; Mr. Jasper Spencer holds the main mass.

Bibliography:
  • Stoeffler D., Knoell H.-D., Marvin U.B., Simonds C.H., and Warren, P.H. (1980) Recommended classification and nomenclature of lunar highland rocks - A committee report. In: Conference on the Lunar Highlands Crust, Houston, Tex., November 14-16, 1979, Proceedings. (A81-26201 10-91) New York and Oxford, Pergamon Press, 1980, p. 51-70. (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Facebook Messenger
Date:P Sep 2021
Mass (g):16
Pieces:1
Class:Lunar (melt breccia)
Fayalite (mol%):27.9±14.3 (N=13)
Ferrosilite (mol%):32.4±0.8 (N=6)
Wollastonite (mol%):3.4±0.5 (N=6
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):3.6
Type spec location:Cascadia
Main mass:Mr. Jasper Spencer
Comments:Lab number CML 1506; submitted by Melinda Hutson
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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