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Northwest Africa 12191
Basic information Name: Northwest Africa 12191
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12191
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass:help 574 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 12191 (NWA 12191)

Western Sahara

Purchased: May 2018

Classification: Ureilite

History: Found in Agmamin region, Western Sahara, February 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone; irregular, weatherd exterior; saw cut reveals an interior mosaic of light-brown and dark-gray crystals.

Petrography: (C. Agee, UNM) This meteorite consists of olivine, pigeonite, and Fe-metal. Ubiquitous, finely disseminated Fe-metal is occupies zones between silicate grain boundaries. A carbon polymorph (diamond or graphite) is present.

Geochemistry: (C. Agee, UNM) Olivine Fa15.4±0.1, Fe/Mn=36±1, Cr2O3=0.59±0.01 (wt%), n=6; pigeonite Fs9.8±2.1Wo7.0±1.8, Fe/Mn=14±4, n=6.

Classification: Ureilite

Specimens: 20.1 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):574
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):15.4±0.1
Ferrosilite (mol%):9.8±2.1
Wollastonite (mol%):7.0±1.8
Classifier:C. Agee, UNM
Type spec mass (g):20.1
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH-352; 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:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 197 approved meteorites from Western Sahara (plus 19 unapproved names)

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