header
  MetSoc Home            Publications            Search Meteorites  
Search the Meteoritical Bulletin Database
Last update: 21 May 2017
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 6920
Basic information Name: Northwest Africa 6920
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6920
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 1468 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 336 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 29 Nov 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6920 (NWA 6920)

Northwest Africa

Purchased: Mar 2011

Classification: HED achondrite (Howardite)

Petrography: Breccia containing distinctive yellowish diogenite clasts, and calcic plagioclase has been partly to totally converted by shock to maskelynite. Relatively coarse-grained basaltic eucrite clasts and related debris are subordinate to diogenite clasts (of several types ranging up to unusually ferroan orthopyroxene compositions) plus related debris. Accessory minerals include chromite, silica polymorph, ilmenite and troilite. This specimen appears to be paired with NWA 6709.

Geochemistry: Diogenite orthopyroxene Fs38.4-38.9Wo2.9-2.3, Fs29.5Wo1.5, Fs22.6Wo1.1 (FeO/MnO=30-36), host orthopyroxene Fs47.6Wo2.1, FeO/MnO=30), augite exsolution lamellae Fs16.3-17.6Wo42.7-42.5, FeO/MnO=26-27.

Data from:
  MB100
  Table 1
  Line 1540:
Place of purchase:Erfoud
Date:P Mar 2011
Mass (g):1468
Pieces:1
Class:Howardite
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):22.6-38.9
Wollastonite (mol%):1.1-2.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.5
Type spec location:UWS
Main mass:A. Hmani
Comments: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)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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)
ironee   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 5792 approved meteorites from (Northwest Africa) (plus 2067 unapproved names)

Direct link to this page