Meteoritical Bulletin: Entry for Northwest Africa 10657

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Northwest Africa 10657

Basic information

Name: Northwest Africa 10657
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10657
Observed fall: No
Year found: 1999
Country: Morocco
Mass: 91.6 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Ureilite-pmict
Recommended:			Ureilite-pmict [explanation]

This is 1 of 34 approved meteorites classified as Ureilite-pmict. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 1 Jun 2016

Writeup

Writeup from MB 105:

Northwest Africa 10657 (NWA 10657)

Zagora, Morocco

Purchased: 1999

Classification: Ureilite (polymict)

Petrography: The sample is a fragmental breccia dominated by mineral and lithic clasts of various ureilitic materials (olivine with reduced rims, pyroxenes, minor Fe,Ni metal, troilite, and carbon phases). Additionally, there are minor feldspathic clasts, dark (carbonaceous chondrite-like) clasts, and ordinary chondrite clasts.

Geochemistry: For ureilitic clasts, olivine core compositions range from Fa₁₀to Fa_25.Olivine rims are reduced as low as Fa_1.Pyroxenes include orthopyroxene (Wo_<5Fs₁₄), pigeonite (Wo_5-11Fs_4-23) and augite (Wo₃₈Fs₆). Because of the polymict nature of the sample, the average compositions of minerals are not meaningful. Sulfides are mostly Cr-bearing troilite.

Specimens: 18.5 g at TCU.

Data from:
  MB105
  Table 0
  Line 0:

State/Prov/County:	Zagora
Place of purchase:	Zagora
Date:	P 1999
Mass (g):	91.6
Pieces:	5
Class:	Ureilite-pmict
Weathering grade:	medium
Fayalite (mol%):	10-25
Classifier:	C. Goodrich, PSI, and Michael Zolensky, JSC
Type spec mass (g):	18.5
Type spec location:	TCU
Main mass:	C. Goodrich and M. Zolensky
Comments:	Informally called LMT 204 as a field name.; submitted by Cyrena Goodrich

Institutions
and collections

JSC: Mailcode XI, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 28 Jul 2022)
TCU: Oscar E. Monnig Collection, Department of Geology, Texas Christian University, Ft. Worth, TX 76129, United States; Website (institutional address; updated 24 Feb 2012)
PSI: Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719-2395, United States (institutional address; updated 22 May 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is the only approved meteorite from Zagora, Morocco
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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