Meteoritical Bulletin: Entry for Northwest Africa 7184

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Northwest Africa 7184

Basic information

Name: Northwest Africa 7184
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7184
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 775 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	CR2
Recommended:			CR2 [explanation]

This is 1 of 188 approved meteorites classified as CR2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites

Comments:

Approved 6 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 7184 (NWA 7184)

(Northwest Africa)

Purchased: 2009 Oct

Classification: Carbonaceous chondrite (CR2)

History: Purchased by Twelker in 2011 August from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed medium-sized (0.3 to 0.7 mm) chondrules in a dark-brown, fine-grained matrix containing hydrous minerals (including cronstedtite), Ni-bearing sulfides and rare chlorapatite. Olivine, orthopyroxene, pigeonite, augite, chromite and troilite.

Geochemistry: Olivine (Fa_1.5-51.5; Cr₂O₃ in ferroan olivine 0.06-0.38 wt.%, mean 0.20 wt.%, s.d. 0.13 wt.%, N = 8), orthopyroxene (Fs_2.6Wo_0.3), pigeonite (Fs_27.3Wo_14.5), augite (Fs_15.2Wo_45.6). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ¹⁷O = 0.33, 0.84; δ¹⁸O = 4.12, 4.74; Δ¹⁷O = -1.844, -1.652 per mil

Classification: Carbonaceous chondrite (CR2).

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2009 Oct
Mass (g):	775
Pieces:	1
Class:	CR2
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	1.5-51.5
Ferrosilite (mol%):	2.6
Wollastonite (mol%):	0.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	24.8
Type spec location:	UWB
Main mass:	E. Twelker
Comments:	ET09-1; submitted by A. Irving

Plots:

O isotopes:

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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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