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Northwest Africa 14992
Basic information Name: Northwest Africa 14992
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14992
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 158 g
Classification
  history:
Recommended:  Lunar (basalt)    [explanation]

This is 1 of 23 approved meteorites classified as Lunar (basalt).   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Jul 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14992 (NWA 14992)

(Northwest Africa)

Purchased: 2022

Classification: Lunar meteorite (basalt)

History: Reportedly found in 2021 and purchased by Ziyao Wang in 2022 from a meteorite dealer in Mauritania.

Physical characteristics: Single stone with irregular brown exterior surface, no fusion crust present. Fresh broken surface shows a fine-grained mix of gray and light brown grains, with abundant shiny fine grained maskelynite, and some small dark shock melt veins. Unbrecciated.

Petrography: (C. Agee, UNM) Backscatter electron and reflected light microscope images show igneous-zoned olivines and pyroxenes. The modal abundance ration of olivine to pyroxene is approximately 1:3. Maskelynite makes up approximately 25% of the modal mineralogy. Minor phases include Ti-Cr spinel, Ti-magnetite, ilmenite, troilite, taenite, and kamacite. A prominent shock melt vein was present in the deposit sample microprobe mount.

Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa53.7±10.1, Fe/Mn=103±10, n=10; clinopyroxene Fs40.2±12.4Wo23.7±7.1, Fe/Mn=64±8, n=20; maskelynite An88.0±2.1Ab11.5±1.9, n=7. Quench melt SiO2=44.0±0.6, TiO2=2.0±0.1, Cr2O3=0.48±0.04, Al2O3=10.5±1.8, MgO=8.0±0.7, FeO=20.8±1.3, MnO=0.24±0.03, CaO=10.6±0.4, Na2O=0.45±0.05, (all wt%, 30 micron defocused beam), n=4. 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 is a low-Ti mare basalt (Giguere et al. 2000).

Specimens: 21 g including a probe mount on deposit at UNM, WangZ 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:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022
Mass (g):158
Pieces:1
Class:Lunar (basalt)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):53.7±10.1
Ferrosilite (mol%):40.2±12.4
Wollastonite (mol%):23.7±7.1
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:WangZ
Comments:BAS-33; 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)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
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 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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