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Northwest Africa 13916
Basic information Name: Northwest Africa 13916
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13916
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 175.4 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 6 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13916 (NWA 13916)

Algeria

Purchased: 2021

Classification: Lunar meteorite (frag. breccia)

History: Purchased by Douglas Chenin from a Mauritanian meteorite dealer in 2021.

Physical characteristics: This meteorite is a single stone with a shiny desert-weathered, sandblasted surface that displays some light-colored clasts set in a very dark groundmass.

Petrography: (C. Agee, UNM) Electron microprobe analysis of a polished mount shows this meteorite to be a lunar polymict breccia with at least 9 distinct lithologies set in a fine-grained cataclastic groundmass of plagioclase, pyroxene and olivine fragments. Ubiquitous silica, merrillite, Fe-sulfide, Fe-metal (low Ni), and ilmenite were detected.

Geochemistry: (C. Agee, UNM) Groundmass olivine Fa35.0±7.6, Fe/Mn=97±9, n=12; clinopyroxene Fs29.7±9.6Wo16.2±15.2, Fe/Mn=55±4, n=13; plagioclase An97.2±1.3, n=5. Clast-1 (microgabbro) clinopyroxene Fs30.3±11.6Wo30.5±16.9, Fe/Mn=65±8, n=3; plagioclase An95.0±0.3, n=2. Clast-2 (ferroan anorthosite) olivine Fa44.5, Fe/Mn=96, n=1; clinopyroxene Fs23.3Wo29.8, Fe/Mn=51, n=1; plagioclase An97.0, n=1. Clast-3 (impact quench-crystal melt) olivine Fa44.0, Fe/Mn=125, n=1; clinopyroxene Fs34.1±4.2Wo11.3±4.2, Fe/Mn=53±5, n=2; plagioclase An96.8, n=1. Clast-4 (anorthositic gabbro) clinopyroxene Fs26.1Wo27.9, Fe/Mn=55, n=1; plagioclase An97.5, n=1. Clast-5 (troctolite) olivine Fa35.8±8.1, Fe/Mn=96±4, n=2; plagioclase An97.6±2.8, n=2. Clast-6 (anorthositic troctolite) olivine Fa17.9, Fe/Mn=76, n=1; plagioclase An96.2, n=1. Clast-7 (microgabbro) clinopyroxene Fs24.4Wo23.9, Fe/Mn=58, n=1; plagioclase An97.8, n=1. Clast-8 (olivine microgabbro) olivine Fa40.8, Fe/Mn=111, n=1; clinopyroxene Fs28.2Wo18.3, Fe/Mn=64, n=1; plagioclase An96.0, n=1. Clast-9 (lunar granite) alkali feldspar Or76.3±1.4Ab22.0±1.3An1.7±0.0, n=2; silica polymorph (2.5wt% Al2O3).

Classification: Polymict fragmental lunar breccia.

Specimens: 21.2 g on deposit at UNM, DChenin holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):175.38
Pieces:1
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):35.0±7.6
Ferrosilite (mol%):29.7±9.6
Wollastonite (mol%):16.2±15.2
Classifier:C. Agee, UNM
Type spec mass (g):21.2
Type spec location:UNM
Main mass:DChenin
Comments:Fieldname DC3; 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)
DChenin: The Dr. Douglas Chenin Collection, United States; Website (institutional address; updated 15 Mar 2021)
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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