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Northwest Africa 14577
Basic information Name: Northwest Africa 14577
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14577
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1008 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Lunar (frag. breccia)
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 30 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 Jan 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14577 (NWA 14577)

(Northwest Africa)

Purchased: 2021

Classification: Lunar meteorite (frag. breccia)

History: Purchased from a meteorite dealer in Mauritania in 2021.

Physical characteristics: Two identical appearing pieces (768 and 240 g) found together. Saw cut slice surface shows numerous white, light gray and dark gray clasts set in a very dark gray to black host groundmass.

Petrography: (A. Ross and C. Agee, UNM) Electron microprobe analysis and reflected light microscopy indicate a lunar polymict breccia. There is a very large range of olivine and pyroxene compositions present. Major phases are plagioclase, pyroxene, and olivine, with pyroxene being more abundant than olivine; minor phases, ilmenite, zircon, silica, and Fe-metal (low Ni) were detected.

Geochemistry: (A. Ross, UNM) Plagioclase An93.2±3.2Ab6.5±3.0, n=4; olivine Fa49.9±29.8, range Fa9.2-97.4, Fe/Mn=94±13, n=9; pigeonite Fs51.3±22.4Wo17.0±4.4, Fe/Mn=67±9, n=7; sub-calcic augite Fs28.6±8.6Wo33.1±2.5, Fe/Mn=57±8, n=2.

Classification: Lunar fragmental breccia

Specimens: 21 g on deposit at UNM, Mark Lyon holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):1008
Pieces:2
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):49.9±29.8
Ferrosilite (mol%):51.3±22.4, 28.6±8.6
Wollastonite (mol%):17.0±4.4, 33.1±2.5
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:Mark Lyon
Comments:Field name ML-11; submitted by C. Agee, UNM
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. 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. ?
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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