header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 17 Oct 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:
Limit to approved meteorite names
Search text:  
Northwest Africa 7638
Basic information Name: Northwest Africa 7638
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7638
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 62.8 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L4
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 24 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Feb 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7638 (NWA 7638)

(Northwest Africa)

Purchased: 2006 Feb

Classification: Ordinary chondrite (L4)

History: Purchased by Philip Mani in February 2006 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving & S. Kuehner, UWS) Very fresh specimen composed of well-formed chondrules in a matrix containing sporadic primary voids (inside which chondrule outlines are visible). Minerals are olivine, orthopyroxene, pigeonite, chlorapatite, fresh kamacite and troilite. No plagioclase was found, but there is abundant alkali-rich glass.

Geochemistry: Olivine (Fa23.0-24.2), orthopyroxene (Fs19.3-19.4Wo1.5; some cores Fs9.5Wo0.7), subcalcic augite (Fs11.7-12.8Wo34.9-33.1).

Classification: Ordinary chondrite (L4).

Specimens: Type sample and polished thin section at UWB. Main mass with P. Mani.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2006 Feb
Mass (g):62.8
Pieces:1
Class:L4
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):23.0-24.2
Ferrosilite (mol%):19.3-19.4
Wollastonite (mol%):1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):15.8
Type spec location:UWB
Main mass:P. Mani
Comments:PCM12-30; 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:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

Direct link to this page