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Northwest Africa 12199
Basic information Name: Northwest Africa 12199
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12199
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass:help 499 g
Meteoritical Bulletin:  MB 107  (2018)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 86 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 18 Nov 2018
Writeup from MB 107:

Northwest Africa 12199 (NWA 12199)

Western Sahara

Purchased: May 2018

Classification: Primitive achondrite (Acapulcoite)

History: Found near the Western Sahara-Mauritania border region, February 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Two identically looking stones with weathered exterior. Saw cut reveals an interior fine-grained mosaic of light-brown and dark-gray crystals.

Petrography: (C. Agee, UNM) Recrystallized texture with triple junctions. Grain size about 250 µm. This meteorite consists of olivine, low-Ca pyroxene, and Fe-metal. No plagioclase detected.

Geochemistry: (C. Agee, UNM) Olivine Fa12.0±0.1, Fe/Mn=22±1, Cr2O3=0.50±0.01 (wt%), n=6; low-Ca pyroxene Fs10.4±0.1Wo4.5±0.1, Fe/Mn=14±0, n=7.

Classification: Acapulcoite

Specimens: 21.1 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P May 2018
Mass (g):499
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):12.0±0.1
Ferrosilite (mol%):10.4±0.1
Wollastonite (mol%):4.5±0.1
Classifier:C. Agee, UNM
Type spec mass (g):21.1
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH-360; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Western Sahara

     This is 1 of 254 approved meteorites from Western Sahara (plus 20 unapproved names)

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