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Northwest Africa 14686
Basic information Name: Northwest Africa 14686
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14686
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 12 kg
Classification
  history:
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 19 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14686 (NWA 14686)

(Northwest Africa)

Purchased: 2020

Classification: Lunar meteorite (frag. breccia)

History: Purchased January, 2020 by Mark Lyon from a Northwest African dealer

Physical characteristics: Eight identical looking stones of varying sizes without fusion crust. Cut surface of one of the stones reveals a fragmental breccia set in a dark-gray ground mass.

Petrography: (A. Ross, UNM; D. Dickens, NMMS; C. Agee, UNM) This meteorite is a clast-rich polymict breccia with lithic fragments embedded in a fine-grained moderately vesiculated groundmass showing dispersed melt features. Quenched melt pockets were observed enclosing some olivine and pyroxenes grains. Fragmental clasts sizes range from <0.1-8 mm and appear to be primarily basaltic. Kamacite, Cr-spinels, silica, troilite, and ilmenite are present. A range of Cr and Ti oxides were detected. This meteorite is shocked with intermittent impact melt textures present.

Geochemistry: (A. Ross, UNM) Olivine Fa64.4±8.6, Fe/Mn=89±9, n=6; pigeonite Fs40.0±10.0Wo8.0±0.1, Fe/Mn=57±3, n=2; high-Ca pyroxene Fs17.8±9.3Wo34.4±13.6, Fe/Mn=50±7 n=2; plagioclase An96.6±0.8Ab3.2±0.8Or0.2±0.1, n=4

Classification: Lunar Fragmental Breccia

Specimens: 22.1 g including a probe mount on deposit at UNM, Mark Lyon holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020
Mass (g):12000
Pieces:8
Class:Lunar (frag. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):64.4±8.6
Ferrosilite (mol%):40.0±10.0, 17.8±9.3
Wollastonite (mol%):8.0±0.1, 34.4±13.6
Classifier:C. Agee, UNM; D. Dickens, NMMS
Type spec mass (g):22.1
Type spec location:UNM
Main mass:Mark Lyon
Comments:Field Name ML-21; submitted by D. Dickens
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 Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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

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