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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
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 19 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jun 2021
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:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):296.8
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
   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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann      

     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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