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Northwest Africa 12947
Basic information Name: Northwest Africa 12947
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12947
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 26.08 kg
Meteoritical Bulletin:  MB 108  (2020)  L3
Recommended:  L3    [explanation]

This is 1 of 763 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 11 Oct 2019
Writeup from MB 108:

Northwest Africa 12947 (NWA 12947)

(Northwest Africa)

Purchased: 2018 Oct

Classification: Ordinary chondrite (L3)

History: Purchased by Darryl Pitt in February 2019 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely packed chondrules (apparent diameter 780±340 µm, N = 24) are set in a sparse finer-grained matrix containing stained metal.

Geochemistry: Olivine, Fa25.3±4.3 (range Fa20.1-31.5, N = 5); low-Ca pyroxene, Fs13.6±12.6Wo0.5±0.2 (range Fs3.7-21.7Wo0.2-0.8, N = 4). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.67.

Classification: Ordinary chondrite (L3).

Specimens: 25.7 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 Oct
Mass (g):26076
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):25.3±4.3
Ferrosilite (mol%):13.6±12.6
Wollastonite (mol%):0.5±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.7
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 479; 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, 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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