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Northwest Africa 12188
Basic information Name: Northwest Africa 12188
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12188
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 209 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 481 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 18 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12188 (NWA 12188)

Mauritania

Purchased: May 2018

Classification: Ureilite

History: Found in the Adrar region of Mauritania, February 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone; sandblasted exterior; saw cut reveals an interior mosaic of light- and dark-gray crystals; minor amount iron-staining present.

Petrography: (C. Agee, UNM) This meteorite consists of olivine, pigeonite, and augite. Ubiquitous Fe-metal is present along grain boundaries, small (<100 μm) metal blebs are scattered throughout, and there are numerous Fe-metal/oxide veinlets crosscutting the silicate grains. Silicates are highly equilibrated both compositionally and texturally, no oxidation reduction rims observed on olivine grains. No graphite or diamond was observed.

Geochemistry: (C. Agee, UNM) Olivine Fa12.1±0.1, Fe/Mn=21±1, Cr2O3=0.50±0.01 (wt%), n=6; pigeonite Fs11.1±1.6Wo4.5±0.1, Fe/Mn=15±1, n=2; augite Fs6.0±0.2Wo36.5±0.5, Fe/Mn=10±0, n=2.

Classification: Augite-bearing ureilite

Specimens: 22.2 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P May 2018
Mass (g):209
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):12.1±0.1
Ferrosilite (mol%):11.1±1.6, 6.0±0.2
Wollastonite (mol%):4.5±0.1, 36.5±0.5
Classifier:C. Agee, UNM
Type spec mass (g):22.2
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH-349; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 95 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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