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Northwest Africa 16444
Basic information Name: Northwest Africa 16444
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16444
Observed fall: No
Year found: 2023
Country: Mali
Mass:help 1475 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 16444 (NWA 16444)


Purchased: 2023 Jun

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Mbark Arjdal in June 2023 from a Malian dealer.

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Small well-defined, unequilibrated chondrules (apparent diameter 240±150 µm, N = 26), accompanied by small mineral fragments and small CAI, are set in a fine-grained matrix (~15 vol.%, deep red-brown in thin section) containing kamacite, taenite, Cr-poor magnetite and troilite plus minor secondary Fe oxide and Ca sulfate. Phases identified in CAI include gehlenite, Al-Ti-diopside, spinel and perovskite.

Geochemistry: Olivine (Fa28.1±26.7, range Fa0.3-70.2, N = 5; Cr2O3 in ferroan olivine 0.04-0.27 wt.%, mean 0.18±0.08 wt.%, N = 6), low-Ca pyroxene (Fs2.3±2.4Wo2.0±1.9, range Fs1.0-5.1Wo0.7-4.1, N = 3), pigeonite (Fs6.4Wo8.9), Al-diopside (Fs1.1Wo45..8, Al2O3 8.5 wt.%; Fs0.4Wo51.5, Al2O3 3.8 wt.%; N = 2), plagioclase in chondrule (An93.8Or0.0), magnetite (Cr2O3 0.75-0.76 wt.%, N = 2).

Classification: Carbonaceous chondrite (CO3).

Specimens: 30.1 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2023 Jun
Mass (g):1475
Shock stage:S2
Weathering grade:low
Fayalite (mol%):28.1±26.7
Ferrosilite (mol%):2.3±2.4
Wollastonite (mol%):2.0±1.9
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):30.1
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 853; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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     This is 1 of 111 approved meteorites from Mali (plus 2 unapproved names)

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