header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Aug 2019
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 6722
Basic information Name: Northwest Africa 6722
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6722
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 443 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 6 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 6722 (NWA 6722)

Northwest Africa

Purchased: 2011 Feb

Classification: Ordinary chondrite (L3.5)

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, medium-sized (some to 0.7 mm) chondrules in a matrix containing stained metal. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite, Ni-bearing troilite and pentlandite.

Geochemistry: Olivine (Fa13.7-36.8; Cr2O3 for ferroan olivine grains = 0.05 to 0.10 wt.%, mean 0.07, s.d. 0.02, N = 7), orthopyroxene (Fs2.3-6.9Wo0.4-0.7), clinopyroxene (Fs3.1-6.5Wo35.1-27.1).

Classification: Ordinary chondrite (L3.5). Subtype estimated to be 3.5 based on Cr2O3 range in ferroan olivine. Estimation of subtype based on histograms (Fig. 4) in Grossman and Brearley (2005).

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Marrakech
Date:P 2011 Feb
Mass (g):442.6
Pieces:1
Class:L3.5
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):13.7-36.8, n=9
Ferrosilite (mol%):2.3-6.9
Wollastonite (mol%):0.4-0.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:B. Booz
Comments:BB-35; 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 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)
Beat Booz            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

Direct link to this page