Meteoritical Bulletin: Entry for Northwest Africa 10955

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Northwest Africa 10955

Basic information

Name: Northwest Africa 10955
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10955
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 27.3 g

Classification
history:

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

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 17 Dec 2016

Writeup

Writeup from MB 105:

Northwest Africa 10955 (NWA 10955)

(Northwest Africa)

Purchased: 2016 May

Classification: Ureilite

History: Purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate of subequal amounts of olivine (with dark, metal-rich rims) and pyroxene (some exhibiting polysynthetic twinning). Some of the pyroxene is augite and the low-Ca pyroxene could be either orthopyroxene or pigeonite.

Geochemistry: Olivine (cores Fa_12.5-12.8, rim Fa_6.7, N = 3), low-Ca pyroxene (Fs_11.0-11.1Wo_4.7-4.8, N = 2), augite (Fs_6.3-6.6Wo_37.3-36.9, N = 2).

Classification: Ureilite. The rather magnesian olivine, lack of typical more calcic pigeonite, and presence of both low-Ca pyroxene and augite are anomalous features.

Specimens: 6.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2016 May
Mass (g):	27.25
Pieces:	1
Class:	Ureilite
Shock stage:	high
Weathering grade:	low
Fayalite (mol%):	12.5-12.8
Ferrosilite (mol%):	11.0-11.1; 6.3-6.6
Wollastonite (mol%):	4.7-4.8; 37.3-36.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	6
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	BH019; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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