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Northwest Africa 10561
Basic information Name: Northwest Africa 10561
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10561
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 217 g
Meteoritical Bulletin:  MB 105  (2016)  CO3.0
Recommended:  CO3.0    [explanation]

This is 1 of 22 approved meteorites classified as CO3.0.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 26 Mar 2016
Writeup from MB 105:

Northwest Africa 10561 (NWA 10561)

(Northwest Africa)

Purchased: 2015 Dec

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased by Darryl Pitt in December 2015 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Small chondrules, mineral fragments and sparse fine grained CAI are set in a fresh black, opaque matrix (~50 vol.%).

Geochemistry: Olivine (Fa0.5-84.8; Cr2O3 in ferroan examples 0.23-0.64 wt.%, mean 0.42±0.11 wt.%, N = 18), orthopyroxene (Fs0.9-2.0Wo1.1-0.6, N = 3), subcalcic augite (Fs1.0Wo34.6), diopside (Fs0.6-2.1Wo41.5-37.8, N = 2).

Classification: Carbonaceous chondrite (CO3.0). The mean and range of Cr2O3 contents of ferroan olivine occurring as rims on more magnesian olivine is essentially the same as for ALHA 77307, which was designated as a CO3.0 by Grossman and Brearley (2005, Figure 5).

Specimens: 20.0 g including one polished thin section at UWB; remainder with DPitt.

  • 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:Mauritania
Date:P 2015 Dec
Mass (g):217.1
Shock stage:S2
Weathering grade:low
Fayalite (mol%):0.5-84.8
Ferrosilite (mol%):0.9-2.0
Wollastonite (mol%):1.1-0.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWB
Main mass:D. Pitt
Comments:MCVICH 22; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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