Meteoritical Bulletin: Entry for Northwest Africa 7469

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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: 495 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	L3
Recommended:			L3 [explanation]

This is 1 of 861 approved meteorites (plus 2 unapproved names) 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

Writeup

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 (Fa_2.2-47.7; Cr₂O₃ in ferroan examples is 0.05-0.83 wt.%, mean 0.26 wt.%, s.d. 0.30 wt.%, N = 7), orthopyroxene (Fs_1.1-56.7Wo_0.9-0.3), hedenbergite (Fs_46.6Wo_50.1, 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Photos:

Credit	Photos
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 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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