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Northwest Africa 7317
Basic information Name: Northwest Africa 7317
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7317
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 1096 g
Meteoritical Bulletin:  MB 102  (2013)  CR6
Recommended:  CR6    [explanation]

This is 1 of 3 approved meteorites classified as CR6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), and CR chondrites
Comments: Approved 27 Sep 2013
Writeup from MB 102:

Northwest Africa 7317 (NWA 7317)

Northwest Africa

Purchased: 2012

Classification: CR6

History: Purchased by Marcin Cimała and Tomek Jakubowski from two separate dealers in Erfoud and Zagora in 2012 April and June.

Physical characteristics: Four fresh, pale greenish stones (122 g, 151 g, 187 g, 636 g), all partially coated with black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Overall poikiloblastic texture, but there are rare BO chondrules with annular olivine rims. Minerals present include olivine (some as larger grains), orthopyroxene, minor clinopyroxene, intermediate plagioclase, fresh kamacite, chromite, troilite, and merrillite.

Geochemistry: Olivine (Fa38.0-38.2, FeO/MnO = 72-79), orthopyroxene (Fs29.3-29.4Wo3.3-3.0, FeO/MnO = 53-61), clinopyroxene (Fs12.8-14.2Wo42.7-40.5, FeO/MnO = 40-41). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O = 0.057, 0.064; δ18O = 3.507, 3.594; Δ17O = -1.788, -1.827 per mil.

Classification: Carbonaceous chondrite (CR6). This specimen is a highly equilibrated CR chondrite paired with NWA 2994, NWA 3250, NWA 6901 and NWA 6921.

Specimens: A total of 22 g of sample and one polished thin section are on deposit at UWB. Mr. M. Cimała and Mr. T. Jakubowski jointly hold the main masses.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):1096
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):38.0-38.2
Ferrosilite (mol%):29.3-29.4; 12.8-14.2
Wollastonite (mol%):3.3-3.0; 42.7-40.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:M. Cimala/T. Jakubowski
Comments:MC101; 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)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann      
Gregor H.   
Marcin Cimala                        
Solar Anamnesis         
Woreczko Jan & Wadi      

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

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