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Northwest Africa 11721
Basic information Name: Northwest Africa 11721
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11721
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 5.35 kg
Meteoritical Bulletin:  MB 107  (2018)  R3
Recommended:  R3    [explanation]

This is 1 of 72 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 7 Apr 2018
Writeup from MB 107:

Northwest Africa 11721 (NWA 11721)

(Northwest Africa)

Purchased: 2017 Dec

Classification: Rumuruti chondrite (R3)

History: A batch of about 10 stones with similar appearance (total 5345 g, the largest stone 2670 g) was purchased by Jason Phillips in December 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular clasts in a matrix of related debris. Clasts contain well-formed, separated unequilibrated chondrules (apparent diameter 310±200 µm, N = 15) set in a finer grained metal-free matrix. Accessory minerals are sodic plagioclase, troilite, Ti-chromite and chlorapatite.

Geochemistry: Olivine (Fa7.0-57.4, N = 5), orthopyroxene (Fs0.7-8.1Wo0.1, N = 2), pigeonite (Fs32.7Wo6.6), augite (Fs11.7Wo44.7). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.43.

Classification: R3 chondrite (breccia).

Specimens: 25.3 g including one polished thin section at UWB; remainder with Mr. J. Phillips.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Dec
Mass (g):5345
Shock stage:S2
Weathering grade:low
Fayalite (mol%):7.0-57.4
Ferrosilite (mol%):8.1-32.7
Wollastonite (mol%):0.1-6.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):25.3
Type spec location:UWB
Main mass:J. Phillips
Comments:Work name JP18-1; submitted by A. Irving
   and collections
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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