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Northwest Africa 7320
Basic information Name: Northwest Africa 7320
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7320
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 52 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 189 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 30 Oct 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7320 (NWA 7320)

(Northwest Africa)

Purchased: 2011 Dec

Classification: Martian meteorite (Shergottite)

History: Purchased by Luc Labenne from a dealer in Zagora, Morocco, in 2011 December.

Physical characteristics: A single elongate, coarse-grained 52 g stone, with clearly visible grains of limpid, glassy maskelynite.

Petrography: (A. Irving and S. Kuehner, UWS) Coarse grained with gabbroic texture. The primary minerals are clinopyroxene (as equant grains up to 2.2 mm across) and maskelynite (as laths up to 3 mm long), accompanied by accessory intergrown Ti-magnetite and ilmenite, pyrrhotite, chlorapatite, and merrillite. Pyroxene is complexly zoned from pigeonite and subcalcic augite to ferropigeonite rims, associated with fayalite and intergrowths of hedenbergite+fayalite+silica after former pyroxferroite. Minor terrestrial barite and calcite occur along some grain boundaries.

Geochemistry: Pigeonite (Fs34.5-38.3Wo17.8-11.4, FeO/MnO = 28-31), subcalcic augite (Fs26.8Wo31.9, FeO/MnO = 29), ferropigeonite rims (Fs74.2-80.9Wo17.1-12.4, FeO/MnO = 34-41), plagioclase (An47.9-58.8Or1.8-1.0).

Classification: Martian (shergottite). Based upon its very coarse grainsize, this specimen could be designated as a gabbroic shergottite.

Specimens: 10.4 g is on deposit at UWB. The main mass is held by Labenne.

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2011 Dec
Mass (g):52
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):34.5-38.3; 26.8; 74.2-80.9
Wollastonite (mol%):17.8-11.4; 31.9; 17.1-12.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):10.4
Type spec location:UWB
Main mass:L. Labenne
Comments: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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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