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Northwest Africa 13989
Basic information Name: Northwest Africa 13989
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13989
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 297 g
Classification
  history:
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 26 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13989 (NWA 13989)

(Northwest Africa)

Purchased: 2021

Classification: Lunar meteorite (frag. breccia)

History: Purchased from an Algerian meteorite dealer in 2021.

Physical characteristics: This meteorite is a single stone with a hemispherical shape and a dark colored, shiny, sandblasted surface with numerous light-colored clasts visible. A sawm surface reveals a feldspathic breccia host. Contained within the host breccia are distinctive light brown/orange clasts scattered throughout. Some of the brown/orange clasts are up to 1 cm in length.

Petrography: (C. Agee, UNM) Electron microprobe analysis of a polished mount shows this meteorite to be a lunar polymict breccia with a feldspathic breccia host rock consisting of fragments of ferroan olivine and pyroxene, and bytownite plagioclase (Lithology 1) and within it are crystalline domains that appear to be monomineralic aluminous ferro-augite (Lithology 2). Lithology 1 has accessory silica, merrillite, zircon, Fe-sulfide, ilmenite, and two spinels. Lithology 2 has small, sparse inclusions of ilmenite, olivine, pyroxene, and anorthitic plagioclase.

Geochemistry: (A. Ross, UNM) Lithology 1: olivine Fa60.8±16.5, Fe/Mn=98±9, n=12; clinopyroxene Fs29.7±9.6Wo23.3±8.4, Fe/Mn=72±9, n=15; plagioclase An78.2±9.0, n=7. Lithology 2: aluminous ferro-augite Fs43.6±0.1Wo28.1±0.2, Fe/Mn=82±8, Al2O3=10.4±0.1 (wt%) n=4.

Classification: Polymict fragmental lunar breccia

Specimens: 20 g on deposit at UNM, Craig Zlimen, Tom Thiegs and Brett Cohen hold the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):296.8
Pieces:1
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):60.8±16.5
Ferrosilite (mol%):58.9±18.9
Wollastonite (mol%):23.3±8.4
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Craig Zlimen, Tom Thiegs and Brett Cohen
Comments:Submitted by C. Agee
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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