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Northwest Africa 10580
Basic information Name: Northwest Africa 10580
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10580
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 250 g
Meteoritical Bulletin:  MB 105  (2016)  CO3
Recommended:  CO3    [explanation]

This is 1 of 648 approved meteorites (plus 2 unapproved names) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 2 Apr 2016
Writeup from MB 105:

Northwest Africa 10580 (NWA 10580)

(Northwest Africa)

Purchased: October 2015

Classification: Carbonaceous chondrite (CO3)

History: Purchased from a Moroccan dealer, October 2015.

Physical characteristics: Many identical appearing stones. Shiny, black to dark brown, smooth weathered exterior with very small chondrule pits; saw cuts reveals numerous small chondrules and a few small CAIs set in a dark-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, many fragmental or irregular, most in the size range 50-200 μm, a few up to 600 μm. Scattered metal/sulfide blebs, fine-grained matrix makes up about 50% of this meteorite. Most chondrules appear to be Type I with forsteritic olivine, enstatitic pyroxene or aluminous diopside. Very few Type II chondrules were observed.

Geochemistry: (C. Agee and M. Spilde, UNM) All chondrule olivine Fa9.5±17.5, Cr2O3=0.33±0.16, n=20; Type I chondrule olivines Fa0.7±0.2, Cr2O3=0.27±0.16, n=11; ferroan chondrule olivines ranged from Fa2-59 with an average of Fa21.9±23.0, Fe/Mn=78±58, Cr2O3=0.41±0.14, n=9; Type I chondrule low-Ca pyroxene Fs1.3±0.4Wo1.5±1.7, n=5; Type II chondrule low-Ca pyroxene Fs20.6±18.8Wo1.6±1.8, Fe/Mn=69±20, n=2; aluminous diopside Fs3.2±0.8Wo39.7±16.5, n=2.

Classification: Carbonaceous chondrite (CO3), likely type 3.0 based on mean value and sigma of Cr2O3 in ferroan olivine (Grossman and Brearley, 2005), however there were too few Type II chondrules present (n=9) in the probe section to obtain good statistics.

Specimens: 21.73 g including a probe mount on deposit at UNM, Gary Fujihara holds the main mass.

  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P October 2015
Mass (g):250
Shock stage:low
Weathering grade:medium
Fayalite (mol%):9.5±17.5
Classifier:C. Agee, UNM
Type spec mass (g):21.73
Type spec location:UNM
Main mass:Gary Fujihara
Comments:Submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alan Mazur   
Denis gourgues   

     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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