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Northwest Africa 7469
Basic information Name: Northwest Africa 7469
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7469
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 495 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L3
Recommended:  L3    [explanation]

This is 1 of 711 approved meteorites classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 6 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7469 (NWA 7469)

(Northwest Africa)

Purchased: 2012 Jun

Classification: Ordinary chondrite (L3)

History: Purchased by Gary Fujihara in February 2012 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: Closely packed, well-formed, medium-sized chondrules. Olivine, orthopyroxene, sodic plagioclase, chromite, altered kamacite, troilite and taenite. One unusual grain of Al-Ti-bearing hedenbergite was found.

Geochemistry: Olivine (Fa2.2-47.7; Cr2O3 in ferroan examples is 0.05-0.83 wt.%, mean 0.26 wt.%, s.d. 0.30 wt.%, N = 7), orthopyroxene (Fs1.1-56.7Wo0.9-0.3), hedenbergite (Fs46.6Wo50.1, Al2O3 = 5.3 wt.%, TiO2 = 2.7 wt.%).

Classification: Ordinary chondrite (L3.1). Estimated subtype based on wide Cr2O3 range in ferroan olivine (Grossman and Brearley 2005, Fig. 15).

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012 Jun
Mass (g):495
Pieces:1
Class:L3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):2.2-47.7
Ferrosilite (mol%):1.1-56.7
Wollastonite (mol%):0.0-0.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.8
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF12-13; 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:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Aeroliths Collection Theodossiou      
Public domain photographs:
Gary Fujihara      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7472 approved meteorites from (Northwest Africa) (plus 1988 unapproved names)

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