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Northwest Africa 2633
Basic information Name: Northwest Africa 2633
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2633
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 600 g
Recommended:  CO3    [explanation]

This is 1 of 650 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 8 Feb 2024
Writeup from MB 113:

Northwest Africa 2633 (NWA 2633)

(Northwest Africa)

Purchased: 2004

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Michael Farmer in 2004 from a Moroccan dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Small well-defined, unequilibrated chondrules (apparent diameter 230±150 µm, N = 25) containing devitrified glass, plus small mineral fragments and small very fine-grained CAI, are set in a fine-grained matrix (~20 vol.%, orange-brown in thin section) containing kamacite, chromite, troilite and minor secondary calcite.

Geochemistry: Olivine (Fa27.9±16.2, range Fa0.3-50.9, N = 22; Cr2O3 in ferroan olivine 0.01-0.21 wt.%, mean 0.06±0.06 wt.%, N = 21), low-Ca pyroxene (Fs6.2±2.6Wo2.2±1.4, range Fs2.0-9.3Wo0.6-3.6, N = 6), subcalcic augite (Fs2.2Wo29.1).

Classification: Carbonaceous chondrite (CO3).

Specimens: 46.2 g including one polished thin section at BrownU; remainder with Farmer.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2004
Mass (g):600.2
Shock stage:S2
Weathering grade:low
Fayalite (mol%):27.9±16.2
Ferrosilite (mol%):6.2±2.6
Wollastonite (mol%):2.2±1.4
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):46.2
Type spec location:BrownU
Main mass:Farmer
Comments:Work names F9 and TB548, thin section QJF4; 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)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos from the Encyclopedia of Meteorites:
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     This is 1 of 9570 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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