Meteoritical Bulletin: Entry for Northwest Africa 11324

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Northwest Africa 11324

Basic information

Name: Northwest Africa 11324
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11324
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 80.5 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	CO3
Recommended:			CO3 [explanation]

This is 1 of 636 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 14 Jul 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11324 (NWA 11324)

(Northwest Africa)

Purchased: 2016 Aug

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Ben Hoefnagels in August 2016 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Small, relatively closely packed chondrules (apparent diameter 350±200 μm, N = 12), angular mineral fragments and some very fine-grained, rimmed CAI occur in a sparse orange-brown matrix (~15 vol.%) containing kamacite, troilite and taenite.

Geochemistry: Olivine (Fa_0.1-56.4, Cr₂O₃ in ferroan examples 0.02-0.11 wt.%, mean 0.06±0.03 wt.%, N = 7), orthopyroxene (Fs_0.6-7.8Wo_0.9-3.4, N = 3), pigeonite (Fs_9.1Wo_6.1), diopside (Fs_0.3-0.6Wo_43.5-45.0, N = 2).

Classification: Carbonaceous chondrite (CO3). Chondrules are much more closely packed and the proportion of matrix is lower than in typical CO chondrites. The relatively low chromium contents in ferroan olivine signify a subtype >3.5.

Specimens: 16.8 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2016 Aug
Mass (g):	80.5
Pieces:	2
Class:	CO3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	0.1-56.4
Ferrosilite (mol%):	0.6-7.8
Wollastonite (mol%):	0.9-3.4
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	16.8
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	Work name BH051; 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9128 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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