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Northwest Africa 8733
Basic information Name: Northwest Africa 8733
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8733
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 51 g
Meteoritical Bulletin:  MB 104  (2015)  Lunar (bas/anor)
Recommended:  Lunar (bas/anor)    [explanation]

This is 1 of 3 approved meteorites classified as Lunar (bas/anor).   [show all]
Search for other: Lunar meteorites
Comments: Approved 4 Feb 2015
Writeup from MB 104:

Northwest Africa 8733 (NWA 8733)

(Northwest Africa)

Found: 2014

Classification: Lunar meteorite (basalt/anorthosite)

History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014.

Physical characteristics: Six similar stones with irregular dark exteriors. Saw cuts on two of the stones reveal identical textures: a few white plagioclase grains and lithic clasts, set in a dark-gray matrix, also some bright metallic grains up to 1 mm.

Petrography: (C. Agee, UNM) Microprobe examination polished mount shows a polymict breccia with numerous fragmental olivine, pyroxene, and plagioclase crystals; anorthositic and basaltic clasts throughout. Accessory Fe-metal, ilmenite, chromite, silica, and troilite. Calcite weathering products detected.

Geochemistry: (C. Agee and N. Muttik, UNM). Olivine Fa35.0±10.4, Fe/Mn=96±9, range Fa17.9-64.0, n=22; clinopyroxene Fs36.4±11.1Wo17.0±7.5, Fe/Mn=57±6, range Fs22.3Wo5.6-Fs56.6Wo29.0, n=18; plagioclase An95.0±1.4Ab4.5±1.3Or0.4±0.2, n=7. Shock melt (proxy for bulk composition) SiO2=44.0±1.1, TiO2=0.37±0.10, Al2O3=25.1±4.3, Cr2O3=0.20±0.12, MgO=7.9±1.7, FeO=7.3±3.0, MnO=0.09±0.04, NiO=0.01±0.01, CaO=14.5±1.6, Na2O=0.28±0.27, K2O=0.08±0.03 (wt%), n=3.

Classification: Achondrite (lunar basaltic/anorthositic breccia), moderate weathering grade, high shock stage.

Specimens: A total of 10.5 g including a probe mount on deposit at UNM. DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Mass (g):51
Class:Lunar (bas/anor)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):35.0±10.4
Ferrosilite (mol%):36.4±11.1
Wollastonite (mol%):17.0±7.5
Classifier:C. Agee, UNM
Type spec mass (g):10.5
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MAC 86; submitted by C. Agee, UNM
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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