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Northwest Africa 13178
Basic information Name: Northwest Africa 13178
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13178
Observed fall: No
Year found: 2019
Country: Mali
Mass:help 1876 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 551 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13178 (NWA 13178)

Mali

Purchased: 2019 Aug

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Mbark Arjdal in August 2019 from a dealer in Nouakchott, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely packed, small well-formed chondrules (apparent diameter 220±130 µm, N = 23), very fine-grained CAI and mineral fragments are set in a fine-grained matrix (~15 vol.%, orange-brown in thin section).

Geochemistry: Olivine (Fa30.5±16.1, range Fa1.2-56.8, N = 14; Cr2O3 in ferroan examples 0.03-0.61 wt.%, mean 0.13±0.16 wt.%, N = 11), low-Ca pyroxene (Fs2.0±1.8Wo2.5±1.5, range Fs0.8-5.0Wo0.9-4.1, N = 5), pigeonite (Fs10.7Wo4.5), diopside (Fs1.1Wo43.8).

Classification: Carbonaceous chondrite (CO3).

Specimens: 27.6 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Nouakchott, Mauritania
Date:P 2019 Aug
Mass (g):1876
Pieces:many
Class:CO3
Shock stage:S2
Weathering grade:low
Fayalite (mol%):30.5±16.1
Ferrosilite (mol%):2.0±1.8
Wollastonite (mol%):2.5±1.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):27.6
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 1; submitted by A. Irving
Institutions
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 40 approved meteorites from Mali (plus 1 unapproved name)

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