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Northwest Africa 8637
Basic information Name: Northwest Africa 8637
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8637
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 4.2 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 25 Nov 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8637 (NWA 8637)

(Northwest Africa)

Purchased: 2014 May

Classification: Martian meteorite (Shergottite)

History: Purchased from a Moroccan dealer by John Higgins in May 2014.

Physical characteristics: A small dark, medium-grained stone (4.2 g) with visible maskelynite and dark pyroxene.

Petrography: (A. Irving and S. Kuehner, UWS) Medium-grained (0.4-0.9 mm), subequigranular aggregate of ~40 vol.% olivine, ~40 vol.% intermediate plagioclase (maskelynite) and ~20 vol.% augite with minor pigeonite, Ti-chromite, ilmenite and pyrrhotite. Constituent minerals exhibit little compositional variation.

Geochemistry: Olivine (Fa39.9-41.8, FeO/MnO = 50-55, N = 3), augite (Fs17.2-18.5Wo38.0-36.2, FeO/MnO = 24-28, N = 3), pigeonite (Fs31.0-31.2Wo8.9-13.9, FeO/MnO = 30-33, N = 3) and plagioclase (maskelynite) (An51.4-54.8Or4.7-4.0, N = 3).

Classification: Martian (shergottite, microgabbroic).

Specimens: 1.0 g including a polished probe mount at UWB. The remainder is held by J. Higgins.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014 May
Mass (g):4.2
Pieces:1
Class:Martian (shergottite)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):39.9-41.8
Ferrosilite (mol%):17.2-18.5; 31.0-31.2
Wollastonite (mol%):38.0-36.2; 8.9-13.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):1.0
Type spec location:UWB
Main mass:J. Higgins
Comments:JH14-17; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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