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Northwest Africa 10983
Basic information Name: Northwest Africa 10983
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10983
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 77.5 g
Meteoritical Bulletin:  MB 106  (2018)  R4
Recommended:  R4    [explanation]

This is 1 of 67 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 3 Mar 2017
Writeup from MB 106:

Northwest Africa 10983 (NWA 10983)

(Northwest Africa)

Purchased: 2016 Aug

Classification: Rumuruti chondrite (R4)

History: Puchased in Temara, Morocco by Adam Aaronson in October 2016.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen composed of relatively small, separated chondrules (apparent diameter 300±200 μm) in a finer grained matrix. Minerals are olivine, clinopyroxene, sodic plagioclase, pentlandite, troilite and rare sperrylite; orthopyroxene was not observed. One small inclusion consists of Cr-pleonaste + sodalite + ilmenite + Cr-rich hercynite + albite.

Geochemistry: Olivine (Fa44.2-44.5, N = 3), clinopyroxene (Fs9.9-10.1Wo45.7-45.6, N = 3). Magnetic susceptibility log χ (× 10-9 m3/kg)=3.13. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O 5.174, 5.950; δ18O 4.602, 5.560; Δ17O 2.744, 3.014 per mil.

Classification: R4 chondrite. The olivine is more ferroan than in typical R chondrites. This meteorite extends the known compositional range for R chondrites olivine.

Specimens: 16 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2016 Aug
Mass (g):77.5
Shock stage:S1/2
Weathering grade:low
Fayalite (mol%):44.2-44.5
Ferrosilite (mol%):9.9-10.1
Wollastonite (mol%):45.7-45.6
Magnetic suscept.:3.13
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):16
Type spec location:UWB
Main mass:Aaronson
Comments:M1914; submitted by A. Irving
Plots: O isotopes:  
   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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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