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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:help 217 g
Meteoritical Bulletin:  MB 105  (2016)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 649 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 21 Nov 2016
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 Fa22.5±0.1, Fe/Mn=50±4, Cr2O3=0.68±0.03 (wt%), CaO=0.37±0.03 (wt%), n=4; olivine reduction rims Fa8.5±0.7, Fe/Mn=16±0, Cr2O3=0.96±0.12 (wt%), CaO=0.44±0.02 (wt%), n=2; Pigeonite Fs17.0±2.4Wo11.3±3.2, Fe/Mn=27±3, n=5; pigeonite reduction rim Fs9.3Wo15.7, 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:
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 2015
Mass (g):216.82
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
   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)
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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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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