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Northwest Africa 14137
Basic information Name: Northwest Africa 14137
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14137
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 77 g
Classification
  history:
Recommended:  Lunar (basalt)    [explanation]

This is 1 of 22 approved meteorites classified as Lunar (basalt).   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Aug 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14137 (NWA 14137)

(Northwest Africa)

Find: 2021

Classification: Lunar meteorite (basalt)

History: Reportedly found in 2021 and purchased by Doug Chenin in 2021 from a meteorite dealer in Mauritania.

Physical characteristics: Single stone, with smooth to irregular exterior surface, no fusion crust present, and numerous vesicles pits visible in hand sample. Polished saw cuts reveal a fine-grained mix of dark-gray and light-brown grains, many dark shock melt pockets present. Unbrecciated.

Petrography: (C. Agee, UNM) Backscattered electron images shown igneous-zoned olivines and pyroxenes. Maskelynite makes up approximately 25% of the modal mineralogy, ubiquitous acicular ilmenite ~5%, minor ulvospinel, troilite, chromite and silica observed. Quench melt pockets are present throughout.

Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa57.7±21.1, Fe/Mn=99±4, n=9; clinopyroxene Fs46.1±19.2Wo25.1±5.6, Fe/Mn=64±12, n=12;, maskelynite An88.5±0.8Ab11.0±0.8, n=6. Quench melt SiO2=43.7±0.7, TiO2=4.1±0.3, Cr2O3=0.24±0.08, Al2O3=10.1±1.2, MgO=5.9±1.6, FeO=22.2±1.0, MnO=0.28±0.02, CaO=10.7±0.5, Na2O=0.42±0.16, K2O=0.12±0.05 (all wt%, 30 μm defocused beam), n=8. Clinopyroxene shows Fe-enrichment trends that are continuous from Mg-augite and Mg-pigeonite to subcalcic-ferroaugite/ferropigeonite.

Classification: Lunar (mare basalt). Based on the TiO2 content of quench melt this is meteorite transitional between low-Ti and intermediate-Ti mare basalt (Giguere et al. 2000).

Specimens: 15.9 g including a probe mount on deposit at UNM, DChenin holds the main mass.

Bibliography:
  • Giguere T. A., Taylor G. J., Hawke B. R. and Lucey P. G. (2000) The titanium contents of lunar mare basalts. Meteorit. Planet. Sci. 35, 193–200. (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:2021
Mass (g):77
Pieces:1
Class:Lunar (basalt)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):57.7±21.1
Ferrosilite (mol%):46.1±19.2
Wollastonite (mol%):25.1±5.6
Classifier:C. Agee, UNM
Type spec mass (g):15.9
Type spec location:UNM
Main mass:DChenin
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)
DChenin: The Dr. Douglas Chenin Collection, United States; Website (institutional address; updated 15 Mar 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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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