Meteoritical Bulletin: Entry for Northwest Africa 7209

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Northwest Africa 7209

Basic information

Name: Northwest Africa 7209
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7209
Observed fall: No
Year found: 2008
Country: Morocco
Mass: 268 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	CO3
Recommended:			CO3 [explanation]

This is 1 of 635 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 14 Apr 2012

Writeup

Writeup from MB 100:

Northwest Africa 7209 (NWA 7209)

Morocco

Purchased: Feb 2008

Classification: Carbonaceous chondrite (CO3)

History: Samples were found in Morocco and sent to Cascadia in April 2010.

Physical characteristics: Lacks fusion crust. Many chondrules visible in cut faces, most of which have dark rims.

Petrography: (K. Armstrong and A. Ruzicka, Cascadia) Contains ~40 area% chondrules (diameter 0.17±0.15 mm), AOAs, sparse CAIs, and ~1% metal. Roughly 25% of metal and sulfide is replaced with secondary phases.

Geochemistry: Olivine ranges Fa_3.6-55.3(N=12) but is predominantly forsteritic (Fa mean 5.5±1.5, median 5.3, N=10).

Classification: Carbonaceous chondrite (CO3)

Specimens: Two slices (8.4 g, 11.7 g) plus one polished thin section are on deposit at Cascadia. The main mass is held by Mr. Fred Olsen.

Data from:
  MB100
  Table 1
  Line 1679:

Place of purchase:	Tuscon, AZ
Date:	P Feb 2008
Mass (g):	268
Pieces:	1
Class:	CO3
Shock stage:	S1
Weathering grade:	W2
Fayalite (mol%):	5.5
Classifier:	K. Armstrong, A. Ruzicka, Cascadia
Type spec mass (g):	20.1
Type spec location:	Cascadia
Main mass:	Fred Olsen
Comments:	Submitted by A. Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

Find references in NASA ADS:
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Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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