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Northwest Africa 11900
Basic information Name: Northwest Africa 11900
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11900
Observed fall: No
Year found: 2017
Country: Western Sahara
Mass:help 457 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 544 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 2 Sep 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11900 (NWA 11900)

Western Sahara

Purchased: 2017

Classification: Ureilite

History: Purchased by Dustin Dickens from nomad near Dahkla in Western Sahara.

Physical characteristics: Weathered exteri; saw cut reveals an interior mosaic of green and brown crystals.

Petrography: (C. Agee, UNM) This meteorite consists of olivine, pigeonite, and augite. Ubiquitous fine-grained Fe-metal is present along grain boundaries. Elongate (100-200 μm) grains of graphite are scattered throughout.

Geochemistry: (C. Agee, UNM) Olivine Fa22.2±0.1, Fe/Mn=49±1, Cr2O3=0.36±0.02 (wt%), n=7; pigeonite Fs18.6±0.3Wo4.2±0.1, Fe/Mn=29±1, n=4; augite Fs11.7±0.1Wo34.9±0.1, Fe/Mn=22±1, n=3.

Classification: Augite-bearing ureilite

Specimens: 20.7 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Western Sahara
Date:P 2017
Mass (g):457
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):22.2±0.1
Ferrosilite (mol%):18.6±0.3, 11.7±0.1
Wollastonite (mol%):4.2±0.1, 34.9±0.1
Classifier:C. Agee, UNM
Type spec mass (g):20.7
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-27; 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. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 227 approved meteorites from Western Sahara (plus 19 unapproved names)

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