Meteoritical Bulletin: Entry for Northwest Africa 10900

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Northwest Africa 10900

Basic information

Name: Northwest Africa 10900
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10900
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 217 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 21 Nov 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10900 (NWA 10900)

(Northwest Africa)

Purchased: 2015

Classification: Ureilite

History: Purchased in 2015 by Brahim Tahiri in Morocco and sent to his partner Sean Tutorow for analysis.

Physical characteristics: Single stone with no fusion crust, irregular exterior surface. A sawn surface shows a mosaic of gray-colored silicate grains.

Petrography: (C. Agee, UNM) This meteorite has predominantly olivine and pigeonite. The olivine grain boundaries contain fine-grained iron metal and oxidized iron. Silica-rich melt inclusions are present. Graphite is ubiquitous. No plagioclase was detected.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine cores Fa_22.5±0.1, Fe/Mn=50±4, Cr₂O₃=0.68±0.03 (wt%), CaO=0.37±0.03 (wt%), n=4; olivine reduction rims Fa_8.5±0.7, Fe/Mn=16±0, Cr₂O₃=0.96±0.12 (wt%), CaO=0.44±0.02 (wt%), n=2; Pigeonite Fs_17.0±2.4Wo_11.3±3.2, Fe/Mn=27±3, n=5; pigeonite reduction rim Fs_9.3Wo_15.7, Fe/Mn=10, n=1.

Classification: Ureilite based on iron reduction in rims and grain boundaries of olivines, Cr₂O₃ and CaO content of olivine, typical ureilite mineralogy of olivine + pigeonite, and presence of graphite.

Specimens: 20.54 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Northwest Africa
Date:	P 2015
Mass (g):	216.82
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	22.5±0.1
Ferrosilite (mol%):	17.0±2.4
Wollastonite (mol%):	11.3±3.2
Classifier:	C. Agee, UNM
Type spec mass (g):	20.54
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G674; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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