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Northwest Africa 12198
Basic information Name: Northwest Africa 12198
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12198
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass:help 506 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 660 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12198 (NWA 12198)

Western Sahara

Purchased: May 2018

Classification: Ureilite

History: Found in Western Sahara, April 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone; irregular, weathered 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. Graphite observed.

Geochemistry: (C. Agee, UNM) Olivine Fa21.6±0.3, Fe/Mn=50±3, Cr2O3=0.49±0.27 (wt%), n=6; pigeonite Fs9.8±3.0Wo9.8±3.0, Fe/Mn=18±3, n=5.

Classification: Ureilite

Specimens: 20 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):506
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):21.6±0.3
Ferrosilite (mol%):12.4±1.5
Wollastonite (mol%):9.8±3.0
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-359; 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, MAPS 55, 460-462
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Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 280 approved meteorites from Western Sahara (plus 20 unapproved names)
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Revision
  history:
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