header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 5 Apr 2020
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 7811
Basic information Name: Northwest Africa 7811
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7811
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 95 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 346 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Sep 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7811 (NWA 7811)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by J. Redelsperger in 2011 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.

Geochemistry: Diogenitic orthopyroxene (Fs24.1Wo1.5; FeO/MnO = 34), orthopyroxene (Fs49.9Wo2.5; FeO/MnO = 31), clinopyroxene (Fs20.8-25.8Wo45.1-44.6; FeO/MnO = 32-35), host orthopyroxene (Fs61.6Wo1.8; FeO/MnO = 34), clinopyroxene exsolution lamellae (Fs21.6Wo43.8; FeO/MnO = 34), olivine (Fa92.7).

Classification: Eucrite (polymict breccia).

Specimens: 19.1 g of material and one polished thin section are on deposit at UWB. J. Redelsperger holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2011
Mass (g):95
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):see text
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):19.1
Type spec location:UWB
Main mass:J. Redelsperger
Comments:JR024; 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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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)
Allmeteorite.com         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7250 approved meteorites from (Northwest Africa) (plus 1995 unapproved names)

Direct link to this page