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Northwest Africa 7032
Basic information Name: Northwest Africa 7032
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7032
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 85 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Martian (shergottite) 
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 186 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Dec 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 7032 (NWA 7032)

Morocco

Found: Oct 2011

Classification: Martian meteorite (Shergottite)

History: A small stone was found in October 2011 in southern Morocco and purchased from a Moroccan dealer in Zagora in November 2011 by Luc Labenne.

Physical characteristics: A single very fresh, irregular ellipsoidal stone (85 g) coated by black fusion crust and naturally broken on one side revealing the interior. The specimen resembles a terrestrial microgabbro, and consists of larger black, yellow-green and clear, limpid grains along with small opaque grains.

Petrography: (A. Irving and S. Kuehner, UWS): Medium grained (to 0.9 mm) igneous assemblage of olivine (~40 vol.%), two types of clinopyroxene (~35 vol.%) and maskelynite (~20 vol.%), plus accessory chromite (with variable Ti contents), ilmenite, pyrrhotite and rare Mg-merrillite. Shocked plagioclase has been completely converted to maskelynite. All of the constituent minerals exhibit very limited compositional variation.

Geochemistry: Olivine (Fa45.7-46.1, Fe/Mn=49-51), pigeonite (Fs26.6Wo15.7, Fe/Mn=30), subcalcic augite (Fs23.7Wo25.3, Fe/Mn=28), plagioclase (An55.2-58.5Or1.7-1.5). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ17O = 2.681, 2.577; δ18O = 4.599, 4.423; Δ17O = 0.259, 0.248 per mil.

Classification: Achondrite (Martian, shergottite). This specimen is unlike most other shergottites in being coarser grained (microgabbroic), and in containing minerals with a high degree of compositional homogeneity.

Specimens: A total of 17.0 g of type material, one polished thin section and a polished mount are on deposit at UWS. The remaining material is held by Labenne.

Data from:
  MB100
  Table 1
  Line 1582:
Place of purchase:Zagora
Date:Oct 2011
Mass (g):85
Pieces:1
Class:Martian (shergottite)
Shock stage:moderate
Weathering grade:very low
Fayalite (mol%):45.7-46.1
Ferrosilite (mol%):26.6; 23.7
Wollastonite (mol%):15.7; 25.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):17
Type spec location:UWS
Main mass:Labenne
Comments:Submitted by A. Irving
Plots: O isotopes:  
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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1346 approved meteorites from Morocco (plus 14 unapproved names) (plus 1 impact crater)

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