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Northwest Africa 7890
Basic information Name: Northwest Africa 7890
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7890
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 5.1 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 289 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 26 Jul 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7890 (NWA 7890)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Martian meteorite (Shergottite)

History: Purchased by A. Debienne in February 2013 from a dealer in Agadir, Morocco, then purchased entirely by PSF.

Physical characteristics: A single stone (5.1 g) lacking fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Medium-grained (up to 3m m) ophitic assemblage of complexly zoned clinopyroxene and lath-like maskelynite with accessory ulvöspinel, ilmenite, phosphates and pyrrhotite. Ulvöspinel contains sparse melt inclusions composed of Si-rich glass with merrillite daughter crystals.

Geochemistry: Pigeonite (Fs56.1-57.7Wo13.7-13.5, FeO/MnO = 38), augite (Fs24.1-39.8Wo32.7-33.4; FeO/MnO = 28-39), plagioclase (An54.0-56.6Or0.9-0.8).

Classification: Martian (shergottite, basaltic). Paired with NWA 2975 and other stones.

Specimens: The whole stone is at PSF.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2013 Feb
Mass (g):5.1
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):56.1-57.7; 24.1-39.8
Wollastonite (mol%):13.7-13.5; 32.7-33.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):5.1
Type spec location:PSF
Main mass:PSF
Comments:AD13009; submitted by A. Irving
Institutions
   and collections		 PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 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 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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