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Northwest Africa 10203
Basic information Name: Northwest Africa 10203
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10203
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 3.3 kg
Meteoritical Bulletin:  MB 104  (2015)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 107 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jul 2015
Writeup from MB 104:

Northwest Africa 10203 (NWA 10203)

(Northwest Africa)

Purchased: 2015

Classification: Lunar meteorite

History: Purchased by Aziz Habibi in 2015; reportedly found in near the border between Mauritania and Mali.

Physical characteristics: Twenty-seven identically appearing pieces reportedly found together. Irregular exterior, no fusion crust. A saw cut reveals a polymict breccia with numerous fragmental light and dark clasts.

Petrography: (C. Agee, UNM) This polymict breccia has at least four distinct lithologies. 1) unbrecciated olivine gabbro with zoned clinopyroxene (~75%), acicular, plumose plagioclase (~15%), olivine (~5%), and minor titanomagnetite; 2) fragmental anorthositic gabbro breccia with ~75% plagioclase; 3) fragmental gabbroic breccia with approximately equal proportions of plagioclase, pyroxene and olivine; 4) shock melt veins and pools, some of which are vesicular. Accessory FeNi-metal, silica, ilmenite, troilite, chromite, and phosphate were observed in the fragmental breccias.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine gabbro: olivine Fa52.9.8±7.1, Fe/Mn=100±12, n=6; clinopyroxene Fs31.1±15.8Wo22.1±7.6, Fe/Mn=41±10, n=7; plagioclase An89.9±3.8Ab8.9±3.4Or1.1±0.8, n=3; anorthositic gabbro breccia: olivine Fa30.6±3.0, Fe/Mn=104±7, n=21; clinopyroxene Fs39.4±15.8Wo21.7±10.9, Fe/Mn=66±11, n=21; plagioclase An96.2±0.8Ab3.5±0.8Or0.2±0.1, n=6; gabbroic breccia: olivine Fa40.3±2.9, Fe/Mn=98±5, n=6; clinopyroxene Fs35.4±14.3Wo23.3±10.0, Fe/Mn=63±10, n=9; plagioclase An93.0±1.6Ab6.6±1.6Or0.4±0.1, n=4; Shock melt (10 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=45.1±2.0, TiO2=0.54±0.38, Al2O3=24.3±6.2, Cr2O3=0.21±0.19, MgO=6.5±2.9, FeO=8.2±3.8, MnO=0.11±0.05, CaO=14.9±1.9, NiO=0.03±0.07, Na2O=0.49±0.13, K2O=0.10±0.03 (all wt%), n=40.

Classification: Lunar (polymict breccia)

Specimens: 24 g including a probe mount on deposit at UNM; Aziz Habibi holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2015
Mass (g):3300
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):52.9.8±7.1, 30.6±3.0, 40.3±2.9
Ferrosilite (mol%):31.1±15.8, 39.4±15.8, 35.4±14.3
Wollastonite (mol%):22.1±7.6, 21.7±10.9, 23.3±10.0
Classifier:C. Agee, UNM
Type spec mass (g):24
Type spec location:UNM
Main mass:Aziz Habibi
Comments:AH-170; 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)
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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Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   
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     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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