header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 24 Jul 2021
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:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northwest Africa 7641
Basic information Name: Northwest Africa 7641
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7641
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 394 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 213 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 14 Nov 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7641 (NWA 7641)

(Northwest Africa)

Purchased: 2012 Oct

Classification: Mesosiderite

History: Purchased by Gary Fujihara in October 2012 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) The specimen contains large grains of metal (kamacite with taenite) and interstitial regions rich in orthopyroxene accompanied by accessory olivine (of variable composition), calcic plagioclase, silica, merrillite, chromite and sparse troilite.

Geochemistry: Orthopyroxene (Fs29.1-31.8Wo2.8-2.9 ; FeO/MnO = 20-27), olivine (Fa27.6, FeO/MnO = 30; Fa37.3, FeO/MnO = 40).

Specimens: 22 g of material is on deposit at UWB. The remaining material is held by Mr. G. Fujihara.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2012 Oct
Mass (g):393.5
Pieces:1
Class:Mesosiderite
Shock stage:low
Weathering grade:low
Fayalite (mol%):27.6; 37.3
Ferrosilite (mol%):29.1-31.8
Wollastonite (mol%):2.8-2.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF12-14; 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)
Gregor H.   
Public domain photographs:
Gary Fujihara   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

Direct link to this page