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Northwest Africa 11559
Basic information Name: Northwest Africa 11559
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11559
Observed fall: No
Year found: 2017
Country: Algeria
Mass:help 33.9 g
Meteoritical Bulletin:  MB 107  (2018)  CO3
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 12 Jan 2018
Writeup from MB 107:

Northwest Africa 11559 (NWA 11559)


Purchased: 2017 Jun

Classification: Carbonaceous chondrite (CO3)

History: Purportedly found near the Algeria/Libya border and purchased by Darryl Pitt in June 2017 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Small, well-formed chondrules (apparent diameter 420 ± 190 µm, N = 20) accompanied by sparse angular mineral grains are set in a finer grained matrix (~40 vol.%, brown in thin section) containing accessory chromite, altered kamacite and pyrrhotite. No CAI were observed.

Geochemistry: Olivine (Fa0.9-41.4, Cr2O3 in ferroan examples <0.02 wt.%, N = 8), orthopyroxene (Fs12.6-23.8Wo2.1-0.6, N = 3), clinopyroxene (Fs9.1-10.9Wo46.8-45.9, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.02.

Classification: Carbonaceous chondrite (CO3). The below detection limit Cr2O3 contents in ferroan olivines indicate a petrologic subtype >3.6.

Specimens: 9.5 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Jun
Mass (g):33.9
Shock stage:S2
Weathering grade:low
Fayalite (mol%):0.9-41.5
Ferrosilite (mol%):12.6-23.8
Wollastonite (mol%):2.1-0.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.5
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 303; 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. 107, MAPS 55, 460-462
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     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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