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Northwest Africa 11203
Basic information Name: Northwest Africa 11203
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11203
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 195.8 g
Meteoritical Bulletin:  MB 106  (2018)  CK6
Recommended:  CK6    [explanation]

This is 1 of 82 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 21 Apr 2017
Writeup from MB 106:

Northwest Africa 11203 (NWA 11203)

(Northwest Africa)

Purchased: March 2016

Classification: Carbonaceous chondrite (CK6)

History: Purchased by Brahim Tahiri in Morocco and sent to his partner Sean Tutorow for analysis.

Physical characteristics: Weathered exterior with some chondrule outlines. Saw cut reveals chondrules, a few small CAIs or white feldspars set in gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a few equilibrated chondrules, significant recrystallized matrix, feldspars up to 200 μm, abundant magnetite, and scattered Fe-Ni sulfides.

Geochemistry: (C. Agee and B. Ha, UNM) Olivine Fa31.3±0.2, Fe/Mn=109±8, NiO=0.49±0.06 (wt%), n=6; low-Ca pyroxene Fs29.3±3.3Wo1.5±1.4, Fe/Mn=80±18, n=3; high-Ca pyroxene Fs15.5±6.0Wo32.9±15.7, Fe/Mn=66±9, n=4; plagioclase Ab 68.1±7.5, n=3.

Classification: Carbonaceous chondrite (CK6). CK based on olivine Fa-content, Fe/Mn, and high Ni content, also presence of abundant magnetite. Type 6 based on low sigma for Fa, large plagioclase grain size, abundant recrystallized matrix and sparse chondrules all of which were texturally equilibrated.

Specimens: 22.33 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P March 2016
Mass (g):195.77
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):31.3±0.2
Ferrosilite (mol%):29.3±3.3
Wollastonite (mol%):1.5±1.4
Classifier:C. Agee, UNM
Type spec mass (g):22.33
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G684; 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)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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