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Northwest Africa 11751
Basic information Name: Northwest Africa 11751
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11751
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 168.7 g
Meteoritical Bulletin:  MB 107  (2018)  CO3.05
Recommended:  CO3.05    [explanation]

This is the only approved meteorite classified as CO3.05.
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 19 Apr 2018
Writeup from MB 107:

Northwest Africa 11751 (NWA 11751)

(Northwest Africa)

Purchased: 2017

Classification: Carbonaceous chondrite (CO3.05)

Physical characteristics: Dark brown stone. Cut surface reveals an almost featurless dark brown interior.

Petrography: (J. Gattacceca, H. Pourkhorsandi, CEREGE ; Lydie Bonal, IPAG) Small chondrules (average apparent diameter 230±100 μm, N=22) set in a fine-grained iron-rich matrix. Chondrules 65 vol%, matrix 35 vol% (point counting, N=213). Small CAI are present. Based on the structural order of the polyaromatic matter assessed by Raman spectroscopy, this meteorite appears to be less metamorphosed than Colony (CO 3.1) and more metamorphosed than ALHA 77307 (CO 3.05). The Raman spectroscopy parameters of interest are FWHM-D (cm-1)=187.6±6.0, ID/IG=1.00±0.04 (see Bonal et al. 2016, GCA 189:312-337, figure 6).

Geochemistry: Olivine Fa10.4±10.0, range Fa0.7-25.4, PMD 91% (N=9), Cr2O3 in ferroan olivine 0.35±0.17 wt% (N=7). Orthopyroxene Fs3.6±1.4Wo3.8±2.0 (N=4). Magnetic susceptibility log χ (× 10-9 m3/kg)=4.69

Classification: Carbonaceous chondrite (CO3.05). Subtype from Raman spectroscopy and Cr2O3 content in ferroan olivine.

Specimens: Type specimen at CEREGE. Main mass with Fabien Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017
Mass (g):168.7
Weathering grade:moderate
Fayalite (mol%):10.4±10.0 (N=9)
Ferrosilite (mol%):3.6±1.4 (N=4)
Wollastonite (mol%):3.8±2.0
Magnetic suscept.:4.69
Classifier:J. Gattacceca, H. Pourkhorsandi, CEREGE
Type spec mass (g):21.10
Type spec location:CEREGE
Main mass:Kuntz
Comments:work name K338; submitted by Jerome 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)
Kuntz: Fabien Kuntz, France; Website (private address)
IPAG: Institut de Planétologie et d’Astrophysique de Grenoble 414, Rue de la Piscine Domaine Universitaire 38400 St-Martin d’Hères , France (institutional address; updated 1 Aug 2013)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   

     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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