header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 Nov 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 6475
Basic information Name: Northwest Africa 6475
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6475
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 602 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 26 Sep 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6475 (NWA 6475)

Morocco

Purchased: 2010 Sep

Classification: HED achondrite (Eucrite, polymict)

History: Material from one large and 13 additional smaller stones were purchased in September 2010 by Marc Jost from a dealer in Semara, southern Morocco.

Physical characteristics: Fourteen stones totaling 602 g of a fragmental breccia containing angular gray, white, black and sparse metal clasts.

Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia composed mostly of basaltic and cumulate eucrite clasts (some partly recrystallized) and related debris, dark carbonaceous chondrite clasts and sparse angular clasts of metal (up to 8 mm across, with narrow oxidized rims). Diogenite clasts and diogenitic orthopyroxene appear to be absent. Minerals include exsolved pigeonite (clinopyroxene lamellae within orthopyroxene host, and vice versa), unexsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, chromite and troilite. Metal clasts consist of kamacite with some enclosed taenite. Chondrite clasts (CM2) consist of dispersed dust-rimmed magnesian chondrules and more ferroan olivine fragments in a dark matrix containing intergrown cronstedtite-tochilinite, pentlandite, Cr-Fe-Ni-phosphosulfide, djerfisherite and calcite (apparently primary), as well as sparse small, rimmed CAI composed predominantly of spinel and perovskite.

Geochemistry: Orthopyroxene (Fs60.7-62.3Wo1.8-1.6; FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs25.6-29.0Wo44.0-41.4; FeO/MnO = 31-33), pigeonite (Fs23.6Wo11.8; FeO/MnO = 30), olivine in chondrite clasts (Fa1.1 and Fa61.7), enstatite in chondrite clasts (Fs1.1Wo2.0; FeO/MnO = 40).

Classification: Achondrite (eucrite, polymict).

Specimens: A total of 20.7 g of type material, one large polished thin section and a serial polished thick section are on deposit at UWS. The remaining material is held by Mr. M. Jost.

Data from:
  MB100
  Table 1
  Line 1388:
Place of purchase:Semara
Date:P 2010 Sep
Mass (g):602
Pieces:14
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):60.7-62.3; 25.6-29.0; 23.6
Wollastonite (mol%):1.8-1.6; 44.0-41.4; 11.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.7
Type spec location:UWS
Main mass:M. Jost
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)
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 from the Encyclopedia of Meteorites:
Stephan Kambach   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Beat Booz            
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1417 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

Direct link to this page