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Northwest Africa 11346
Basic information Name: Northwest Africa 11346
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11346
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 46.9 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  CM-an
Recommended:  CM-an    [explanation]

This is 1 of 9 approved meteorites classified as CM-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 8 Jul 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11346 (NWA 11346)

(Northwest Africa)

Purchased: 2016 Nov

Classification: Carbonaceous chondrite (CM, anomalous)

Physical characteristics: Irregular dark stone. Cut surface reveals a dark interior with small chondrules.

Petrography: Chondrules, mineral and chondrule fragments in a fine-grained Fe-rich matrix. Matrix abundance 53 vol% (from point counting, N=226). Chondrule average apparent diameter 208±121 μm (N=39). Opaques are magnetite, FeNi metal and sulfides. XRD over a several mm2 area on a polished section (D. Borschnek, B. Devouard, CEREGE) does not reveal the presence of hydrous phases (serpentine, tochilinite) typically observed in type 2 chondrites using the same experimental setup.

Geochemistry: Olivine Fa26.7±19.2, range Fa3.3-50.4 (N=5). Orthopyroxene Fs5.88Wo0.3Fs1.7Wo1.0 (N=2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 75 mg bulk sample is δ17O=0.69‰, δ18O=9.38‰, Δ17O=-4.21‰ (linearized, slope 0.5247, analytical uncertainties 0.08, 0.12, 0.03 all ‰ respectively). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.09.

Classification: CM-an. The absence of phyllosilicates is an anomalous feature for a CM chondrite.

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

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Zagora (Morocco)
Date:P 2016 Nov
Mass (g):46.9
Pieces:1
Class:CM-an
Weathering grade:minimal
Fayalite (mol%):26.7±19.2 (N=5)
Ferrosilite (mol%):3.8±2.1 (N=2)
Wollastonite (mol%):0.7±0.3
Magnetic suscept.:4.09
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):9.58
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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6759 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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