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Northwest Africa 11207
Basic information Name: Northwest Africa 11207
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11207
Observed fall: No
Year found: 2016
Country: Western Sahara
Mass:help 100.3 g
Meteoritical Bulletin:  MB 106  (2018)  CK5-an
Recommended:  CK5-an    [explanation]

This is the only approved meteorite classified as CK5-an.
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 22 Apr 2017
Writeup from MB 106:

Northwest Africa 11207 (NWA 11207)

Western Sahara

Purchased: 2016 May 25

Classification: CK5-an

History: Purchased from Abdeltif Mechaguen

Physical characteristics: A dark irregular stone. Cut surface reveals dark interior with mm-sized chondrules.

Petrography: Chondritic texture with abundant recrystallized matrix and mm-sized chondrules. Plagioclase average size in the matrix is below 50 μm. Magnetite is the dominant opaque mineral in the matrix and as large euhedral grains up to 100 μm in the chondrules. Sulfide is present as small grains.

Geochemistry: Olivine Fa24.9±0.3, NiO 0.43±0.07 wt% (N=6), orthopyroxene Fs23.6Wo0.7 (N=1), plagioclase An24.0Ab72.5Or3.6 (N=2). Magnetite has Cr2O3 2.7±0.3 wt%, Al2O3 1.1±0.6 wt%, NiO 0.17±0.10 wt% (N=3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.81.

Classification: CK5-an. Anomalous designation from the unusually Fe-poor olivine. Out of 230 equilibrated CK chondrites with available olivine analyses (data from Meteoritical Bulletin Database as of March 2017), only three have similar or lower Fa content: GRA 98102 (CK4, Fa24), NWA 7615 (CK6, 24.7±0.4), NWA 5580 (CK4-an, Fa25.2).

Specimens: Type specimen and polished sections at CEREGE. Main mass with Pierre-Marie Pelé.

Data from:
  Table 0
  Line 0:
Date:P 2016 May 25
Mass (g):100.3
Fayalite (mol%):24.9±0.3 (N=6)
Ferrosilite (mol%):23.6 (N=1)
Wollastonite (mol%):0.7
Magnetic suscept.:4.81
Classifier:J. Gattacceca, B. Devouard, CEREGE
Type spec mass (g):20.42
Type spec location:CEREGE
Main mass:Pierre-Marie Pelé
Finder:Pierre-Marie Pelé
Comments:work name CC-1602; submitted by Jérôme Gattacceca
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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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Western Sahara

     This is 1 of 263 approved meteorites from Western Sahara (plus 19 unapproved names)

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