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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:help 775 g
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 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 (Fa1.5-51.5; Cr2O3 in ferroan olivine 0.06-0.38 wt.%, mean 0.20 wt.%, s.d. 0.13 wt.%, N = 8), orthopyroxene (Fs2.6Wo0.3), pigeonite (Fs27.3Wo14.5), augite (Fs15.2Wo45.6). 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:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2009 Oct
Mass (g):775
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:  
   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)
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)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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