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Northwest Africa 7387
Basic information Name: Northwest Africa 7387
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7387
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 392 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 195 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 27 Apr 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7387 (NWA 7387)

(Northwest Africa)

Purchased: 2012

Classification: Martian meteorite (Shergottite)

History: Purchased by Giorgio Tomelleri in Erfoud, Morocco.

Physical characteristics: The sample is covered with a black fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP): Cumulate, fine-grained, porphyritic texture consisting of a few large rounded and zoned phenocrysts of brown olivine up to 1200 μm, set in a fine-grained basaltic groundmass of twinned, tabular pyroxene crystals 90 to 2100 μm wide and 120 to 780 μm long. These crystals are surrounded by interstitial glassy matrix, dominated by maskelynite. Pyroxene is primarily pigeonite with subordinate enstatite. Other minerals are chromite, titanian chromite and ilmenite, up to 110 μm, merrillite, and rare pyrrhotite grains up to 40 μm in size. Shock features include strong mosaicism and planar deformation in olivine, undulose extinction and twinning in pyroxene.

Geochemistry: Olivine Fa40.45 (mean of 26 analyses; FeO/MnO = 50.3); orthopyroxene (Fs29.46En60.87Wo9.87; FeO/MnO = 30.9); pigeonite (Fs18.79En48.09Wo33.13; FeO/MnO = 32.5-46.5). Maskelynite glass (An46.34.15Or2.96). Oxygen isotopes: (I.Franchi, R.Greenwood, OU) δ17O = 2.68, δ18O = 4.54, and Δ17O = 0.322 all per mil.

Classification: Martian (Shergottite)

Specimens: 20.13 g plus one polished thin section and a block are on deposit at MSP (MSP 5203). Tomelleri holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2012
Mass (g):392
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):29.46
Ferrosilite (mol%):40.45
Wollastonite (mol%):9.87
Classifier:V. Moggi Cecchi, G. Pratesi, and S. Caporali, MSP
Type spec mass (g):20.61
Type spec location:MSP
Main mass:Giorgio Tomelleri
Finder:unknown
Comments:Inv.# MSP5203; submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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