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Northwest Africa 7042
Basic information Name: Northwest Africa 7042
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7042
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 3.03 kg
Meteoritical Bulletin:  MB 100  (2012)  Martian (shergottite) 
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Dec 2011
Writeup from MB 100:

Northwest Africa 7042 (NWA 7042)


Found: Oct 2011

Classification: Martian meteorite (Shergottite)

History: A large stone was found in October 2011 in southern Morocco and purchased from nomads by two Moroccan dealers.

Physical characteristics: A single 3033 g stone partly coated by thin, brownish remnant fusion crust. Weathered surfaces are mostly brown, with distinctive bright green grains. The fine grained interior has an overall greenish-gray color, with sparkling maskelynite visible in the matrix.

Petrography: (A. Irving and S. Kuehner, UWS): Aphyric assemblage of complexly-zoned pyroxene and zoned olivine with interstitial maskelynite (~15 vol.%, intergrown with ferroan pigeonite) and accessory Ti-poor chromite, ilmenite (some intergrown with ulvöspinel), pyrrhotite and merrillite. Sparse tiny grains of barite (from terrestrial weathering) present.

Geochemistry: Olivine (cores Fa28.5-30.1, Fe/Mn=46-52; rims Fa46.0-48.1, Fe/Mn=48-52), pigeonite (core Fs29.0Wo13.4, Fe/Mn=29; rims and matrix grains Fs41.5-44.5Wo17.5-9.0, Fe/Mn=35-36), subcalcic augite (Fs22.4Wo31.4, Fe/Mn=26), plagioclase (An48.6-54.5Or1.7-1.8).  Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 3.102, 3.016; δ18O = 5.326, 5.079; Δ17O = 0.298, 0.341 per mil.

Classification: Achondrite (Martian, shergottite).

Specimens: A total of 20.2 g of type material and one polished thin section are on deposit at UWS.

Data from:
  Table 1
  Line 1590:
Place of purchase:Erfoud
Date:Oct 2011
Mass (g):3033
Class:Martian (shergottite)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):28.5-48.1
Ferrosilite (mol%):29.0; 41.5-44.5; 22.4
Wollastonite (mol%):13.4; 17.5-9.0; 31.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWS
Main mass:anonymous
Comments:Submitted by A. Irving
Plots: O isotopes:  
   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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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