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Northwest Africa 10503
Basic information Name: Northwest Africa 10503
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10503
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 407 g
Meteoritical Bulletin:  MB 105  (2016)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 154 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 11 Mar 2016
Writeup from MB 105:

Northwest Africa 10503 (NWA 10503)

(Northwest Africa)

Purchased: 2015 May

Classification: Ungrouped achondrite

History: Purchased by Fabien Kuntz in May 2015 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Triple-grain-junction texture, grain size 0.1-0.7 mm. Very fresh assemblage of predominantly olivine with subordinate clinopyroxene (~20 vol.%), intermediate plagioclase (~10 vol.%), and accessory pyrrhotite, chromite, taenite and pentlandite.

Geochemistry: Olivine (Fa31.8-32.0, FeO/MnO = 79-96, N = 3), clinopyroxene (Fs11.4-11.6Wo42.5-42.6, FeO/MnO = 43-44, N = 2), plagioclase (An32.3-33.9Or3.2-3.0). Oxygen isotopes (K. Ziegler, UNM): analyses of nine acid-washed subsamples by laser fluorination gave, respectively, δ17O -3.757, -3.884, -3.950, -3.557, -3.569, -3.779, -3.674, -3.818, -3.968; δ18O -0.848, -1.162, -1.212, -0.555, -0.624, -0.873, -0.792, -0.893, -1.206; Δ17O -3.309, -3.270, -3.310, -3.264, -3.240, -3.318, -3.256, -3.346, -3.331 per mil.

Classification: Achondrite (ungrouped). Despite similarities in texture this meteorite has an oxygen isotopic composition far removed from those of any brachinites, winonaites, and acapulcoites.

Specimens: 26.3 g including one polished thin section at PSF; main mass with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2015 May
Mass (g):407
Shock stage:low
Weathering grade:low
Fayalite (mol%):31.8-32.0
Ferrosilite (mol%):11.4-11.6
Wollastonite (mol%):42.5-42.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26.3
Type spec location:PSF
Main mass:F. Kuntz
Comments:K281; submitted by A. Irving
Plots: O isotopes:  
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
Franco Vignato   
Ziyao Wang         

     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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