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Northwest Africa 12200
Basic information Name: Northwest Africa 12200
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12200
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 76 g
Meteoritical Bulletin:  MB 107  (2018)  CK6
Recommended:  CK6    [explanation]

This is 1 of 81 approved meteorites classified as CK6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 9 Nov 2018
Writeup from MB 107:

Northwest Africa 12200 (NWA 12200)


Purchased: May 2018

Classification: Carbonaceous chondrite (CK6)

History: Found in the Adrar Region, Mauritania, March 2018. Purchased by Darryl Pitt in Mauritania, May 2018.

Physical characteristics: Single stone with irregular weathered surface. A saw cut reveals numerous faint chondrules up to 2mm in diameter set in a dark-gray groundmass. Orange-reddish oxidation staining is visible.

Petrography: (C. Agee, UNM) Microprobe examination shows recrystallized relict texturally equilibrated chondrules set in a recrystallized matrix. Plagioclase grain size up to 300 μm in length. Abundant chromium-rich magnetite observed throughout, some up to 200 μm in size. Only trace amounts of pyroxene are present. Melt pockets observed.

Geochemistry: (C. Agee, UNM) Olivine Fa27.2±0.9, Fe/Mn=89±7, NiO=0.49±0.11, n=13; melt SiO2=34.1±1.9, TiO2+0.15±0.02, Al2O3=5.7±1.9, Cr2O2=0.63±0.11, MgO=21.5±1.0, FeO=26.6±3.3, MnO=0.21±0.03, CaO=5.3±0.3, NiO=0.34±0.05, Na2O=0.65±0.23, K2O=0.08±0.00, Fe/Mn=128±10, n=3; plagioclase Ab52.0±4.3An41.6±7.8Or6.4±5.6, n=6.

Classification: Carbonaceous chondrite (CK6)

Specimens: 15.9 g 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):76
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):27.2±0.9
Classifier:C. Agee, UNM
Type spec mass (g):15.9
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-361; 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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     This is 1 of 200 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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