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Northwest Africa 11224
Basic information Name: Northwest Africa 11224
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11224
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 817 g
Meteoritical Bulletin:  MB 106  (2018)  CK3
Recommended:  CK3    [explanation]

This is 1 of 75 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 10 May 2017
Writeup from MB 106:

Northwest Africa 11224 (NWA 11224)

(Northwest Africa)

Purchased: 2016

Classification: Carbonaceous chondrite (CK3)

History: 1 stone weighing 816.7 g was found in Morocco prior to 2016. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February 2016.

Physical characteristics: Windowed sample has an ovoid shape with a few shallow regmaglypts. Sample is covered (~7%) by a lightly weathered, orange to dark-black, flow-lined fusion crust which contains contraction cracks. Small cracks in the fusion crust show the sample is dark-green in the interior. Cut face shows a dark-green interior with dark-gray chondrules, dark-green clasts, and metallic gray grains.

Petrography: Description and classification (A. Love, App): Sample has a chondritic texture composed of ~60 vol%, well-formed chondrules (with an average diameter of 1059 μm, n=28) and CAIs in a fine-grained matrix dominated by olivine and plagioclase and Cr-magnetite. Olivines within matrix and chondrules show strong compositional zoning with Mg-rich cores and FeO-rich rims. Many chondrules are surrounded by thick concentric igneous and clastic rims.

Geochemistry: (A. Love, App) Fa23.8±11.6 (Fa1.2-35.7), N=24; low Ca pyroxene Fs3.1Wo0.5, N=1; Ca pyroxene Fs1.6Wo38.0, N=1.

Classification: Carbonaceous chondrite (CK3). Texture and mineral compositions indicate sample is a CK3

Specimens: PARI holds the 778.32 g main mass. A 24.95 g type specimen and one polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):816.7
Fayalite (mol%):23.8±11.6 (N=24)
Ferrosilite (mol%):3.1 (N=1)
Wollastonite (mol%):0.48
Classifier:A. Love, App
Type spec mass (g):24.95
Type spec location:App
Main mass:PARI
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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