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Northwest Africa 11345
Basic information Name: Northwest Africa 11345
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11345
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 46 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  CM2
Recommended:  CM2    [explanation]

This is 1 of 529 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 4 Sep 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11345 (NWA 11345)

(Northwest Africa)

Purchased: 2016 Nov

Classification: Carbonaceous chondrite (CM2)

Physical characteristics: Irregular dark stone. Cut surface reveals a dark interior with lighter chondrules to mm size.

Petrography: Chondrules (some with dust rims) and chondrule fragments (33 vol%) set in a fine-grained matrix (67 vol%). Modal abundances from point counting (N=296). Chondrule average apparent diameter 230±110 μm (N=32). XRD over a several mm2 area on a polished section (D. Borschnek, B. Devouard, CEREGE) reveals the presence of phyllosilicates as typically observed in type 2 chondrites using the same experimental setup.

Geochemistry: Olivine Fa46.1±10.4, range Fa33.0-58.0 (N=6). Orthopyroxene Fs3.0±0.9Wo1.9±0.8, range Fs2.1-4.5 (N=5). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 320 mg bulk sample is δ17O=2.13‰, δ18O=8.95‰, Δ17O=-2.55‰ (linearized, slope 0.5247, analytical uncertainties 0.08, 0.12, 0.03 all ‰ respectively). Magnetic susceptibility log χ (× 10-9 m3/kg)=4.46.

Classification: CM2

Specimens: Type specimen at CEREGE. Main maiss with Kuntz.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Ouarzazate (Morocco)
Date:P 2016 Nov
Mass (g):46.0
Pieces:1
Class:CM2
Weathering grade:low
Fayalite (mol%):46.1±10.4 (N=6)
Ferrosilite (mol%):3.0±0.9 (N=5)
Wollastonite (mol%):1.9±0.8
Magnetic suscept.:4.46
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):9.19
Type spec location:CEREGE
Main mass:Kuntz
Comments:Submitted by Jérôme Gattacceca
Plots: O isotopes:  
Institutions
   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)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
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.
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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