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Northwest Africa 11588
Basic information Name: Northwest Africa 11588
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11588
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 10.3 g
Meteoritical Bulletin:  MB 107  (2018)  CM2
Recommended:  CM2    [explanation]

This is 1 of 622 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 3 Feb 2018
Writeup from MB 107:

Northwest Africa 11588 (NWA 11588)

(Northwest Africa)

Purchased: 2017

Classification: Carbonaceous chondrite (CM2)

Physical characteristics: Dark-brown fragments. Cut surface reveals a dark interior with abundant matrix and small chondrules.

Petrography: (J. Gattacceca, H. Pourkhorsandi, CEREGE; L. Bonal, IPAG) Chondrules (average apparent diameter about 200 μm) and chondrules fragments set in a fine-grained iron-rich matrix. Modal abundances: matrix 71 vol%, chondrules and chondrule fragments 29% (point counting, N=317). Infrared transmission spectra of matrix grains reveal the presence of phyllosilicates dominating the mineralogical assemblage and are comparable to those of CM chondrites (Beck et al., 2010. The 3-µm band, whose spectral characteristics are reflecting the chemistry of the phyllosilicate phases and are correlated with the alteration classification scheme of Rubin et al. (2007), shows that this meteorite experienced a relatively low extent of aqueous alteration, comparable to Murray (2.4/2.5).

Geochemistry: Olivine Fa16.6±13.1, PMD 66%, range Fa0.9-37.9 (N=5). Orthopyroxene Fs0.8Ws0.8 and FS7.2Wo3.8 (N=2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.23.

Classification: CM2

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

  • Beck P., Quirico E., Montes-Hernandez G., Bonal L., Bollarda J., Orthous-Daunay F.-R., Howard K.T., Schmitt B., Brissaud O., Deschamps F., Wunder B., and Guillot S. (2010) Hydrous mineralogy of CM and CI chondrites from infrared spectroscopy and their relationship with low albedo asteroids. Geochim. Cosmochim. Acta 74, 4881-4892 (link)
  • Rubin A.E., Trigo-Rogriguez J.M., Huber H., and Wasson J.T. (2007) Progressive aqueous alteration of CM carbonaceous chondrites. Geochim. Cosmochim. Acta 71, 2361-2382 (link)
Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017
Mass (g):10.3
Weathering grade:moderate
Fayalite (mol%):16.6±13.1 (N=5)
Ferrosilite (mol%):0.8; 7.2 (N=2)
Wollastonite (mol%):0.8; 3.8
Magnetic suscept.:4.23
Classifier:J. Gattacceca, H. Pourkhorsandi, CEREGE ; L. Bonal, IPAG
Type spec mass (g):2.25
Type spec location:CEREGE
Main mass:Kuntz
Comments:work name K326; 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)
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)
Wojciech Moscinski   

     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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