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Northwest Africa 16189
Basic information Name: Northwest Africa 16189
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16189
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 6.83 kg
Meteoritical Bulletin:  MB 112  (2023)  Lunar (troct. anorth.)
Recommended:  Lunar (troct. anorth.)    [explanation]

This is 1 of 11 approved meteorites classified as Lunar (troct. anorth.).   [show all]
Search for other: Lunar meteorites
Comments: Approved 13 Nov 2023
Writeup from MB 112:

Northwest Africa 16189 (NWA 16189)

(Northwest Africa)

Purchased: 2022

Classification: Lunar meteorite (troctolitic anorthosite)

History: Purchased by Adam Aaronson in 2022.

Physical characteristics: Exterior surface is irregular shaped and sandblasted with a dark green-gray patina. Freshly broken surface reveals a gray microcrystalline interior with some scattered small vesicles.

Petrography: (C. Agee, ) This meteorite is a fine-grained anorthositic troctolite (Prinz and Keil, 1977) with a plagioclase host (85%), and olivine (15%) and pigeonite (5%) as small poikilitic inclusions. Olivines are up to 50 μm in size, pigeonites are up to 10 µm in size. There are numerous very small vesicles throughout. Accessory chromite was observed.

Geochemistry: (A. Ross, UNM) olivine Fa30.5±3.7, Fe/Mn=88±12, n=6; pigeonite Fs23.6±2.7Wo18.9±5.9, Fe/Mn=48±3, n=6; plagioclase An96.9±0.4Ab2.9±0.3, n=3.

Classification: Lunar (troctolitic anorthosite) based on Stoeffler et al. (1980).

Specimens: 21.8 g including a probe mount on deposit at UNM, Adam Aaronson holds the main mass.

  • 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:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):6829
Class:Lunar (troct. anorth.)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):30.5±3.7
Ferrosilite (mol%):23.6±2.7
Wollastonite (mol%):18.9±5.9
Classifier:C. Agee, UNM
Type spec mass (g):21.8
Type spec location:UNM
Main mass:Aaronson
Comments:M2303; submitted by C. Agee
   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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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