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Northwest Africa 12642
Basic information Name: Northwest Africa 12642
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12642
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 837 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  L4
Recommended:  L4    [explanation]

This is 1 of 1730 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 17 Jun 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12642 (NWA 12642)

(Northwest Africa)

Purchased: 2017 Apr

Classification: Ordinary chondrite (L4)

History: Purchased by Ben Hoefnagels in April 2017 from an Australian dealer, who had acquired the material in Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely-packed, well-formed chondrules are set in a finer grained matrix containing altered metal.

Geochemistry: Olivine (Fa25.3±0.1 (range Fa25.1-25.4), N = 4), low-Ca pyroxene (Fs20.0±1.7Wo0.8±0.6 (range Fs17.4-21.1Wo0.4-1.7), N = 4), pigeonite (Fs18.5Wo6.4).

Classification: Ordinary chondrite (L4).

Specimens: 31.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Australia
Date:P 2017 Apr
Mass (g):837
Pieces:1
Class:L4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):25.3±0.1
Ferrosilite (mol%):20.0±1.7
Wollastonite (mol%):0.8±0.6
Classifier:A. Irving & P. Carpenter
Type spec mass (g):31.1
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH074; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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