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Northwest Africa 11304
Basic information Name: Northwest Africa 11304
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11304
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 920 g
Classification
  history:
Recommended:  R4    [explanation]

This is 1 of 55 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 7 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11304 (NWA 11304)

(Northwest Africa)

Purchased: 2017 April

Classification: Rumuruti chondrite (R4)

History: Purchased by Dustin Dickens in April 2017 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) The specimen is a breccia mostly composed of well-formed, relatively small chondrules (apparent diameter 250±150 µm, N = 12) in a finer grained matrix (~30 vol.%), but some petrologically-similar, angular lithic clasts (including type 3 and type 4 clasts) are also present. Both olivine and orthopyroxene have very magnesian cores, but the predominant mafic minerals are much more ferroan. Other minerals are clinopyroxene, sodic plagioclase, pentlandite, pyrrhotite and magnetite.

Geochemistry: Olivine (cores Fa1.0-1.2; predominantly Fa39.1-41.6; N = 4), orthopyroxene (core Fs4.5Wo0.4; mantle Fs16.3Wo2.7), clinopyroxene (Fs11.0-12.4Wo45.5-41.7, N = 2), plagioclase (Ab85.7An12.3Or14.6).

Classification: R4. May contain R3 material.

Specimens: 21.2 g including one polished thin section at UWB; remainder with Mr. D. Dickens.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017 April
Mass (g):920
Pieces:2
Class:R4
Shock stage:S2
Weathering grade:low
Fayalite (mol%):1.0; 39.1-41.6
Ferrosilite (mol%):4.5; 16.3; 11.0-12.4
Wollastonite (mol%):0.4; 2.7; 45.5-41.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.2
Type spec location:UWB
Main mass:D. Dickens
Comments:Work name DD17-9; submitted by A. Irving
Institutions
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6438 approved meteorites from (Northwest Africa) (plus 2025 unapproved names)

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