Meteoritical Bulletin: Entry for Northwest Africa 11304

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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: 920 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	R4
Recommended:			R4 [explanation]

This is 1 of 68 approved meteorites classified as R4. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 7 Apr 2018

Writeup

help

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 Fa_1.0-1.2; predominantly Fa_39.1-41.6; N = 4), orthopyroxene (core Fs_4.5Wo_0.4; mantle Fs_16.3Wo_2.7), clinopyroxene (Fs_11.0-12.4Wo_45.5-41.7, N = 2), plagioclase (Ab_85.7An_12.3Or_14.6).

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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
chen wang
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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