header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 16 Oct 2018
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
Classification
  history:
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
Writeuphelp
Writeup from MB 102:

Northwest Africa 7317 (NWA 7317)

Northwest Africa

Purchased: 2012

Classification: CR6

History: Purchased by Marcin Cimala 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. Cimala and Mr. T. Jakubowski jointly hold the main masses.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):1096
Pieces:4
Class:CR6
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:  
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gregor H.   
Marcin Cimala                        
Solar Anamnesis   
Woreczko Jan & Wadi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6438 approved meteorites from (Northwest Africa) (plus 2025 unapproved names)

Direct link to this page