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Northwest Africa 11668
Basic information Name: Northwest Africa 11668
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11668
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 20 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 27 Mar 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11668 (NWA 11668)

(Northwest Africa)

Purchased: 2018

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased in Tindouf, Algeria, from a Sahrawi dealer.

Physical characteristics: Four dark-green pieces partly covered with fusion crust.

Petrography: The meteorite is a medium grained basalt predominantly composed of up to 1.5 mm sized pyroxene and plagioclase grains. Pyroxene is intensely fractured pigeonite and augite displaying mottled compositional zoning. Plagioclase is completely transformed into compositionally homogeneous maskelynite. Minor phases are ilmenite, ulvöspinel, pyrrhotite and some Si-rich mesostasis.

Geochemistry: pigeonite: Fs53.7±4.4Wo14.3±2.4 (Fs35.5-59.6Wo9.7-20.0, n=38, FeO/MnO=33-43); augite: Fs26.2±7.0Wo32.2±3.9 (Fs21.1-48.9Wo20.6-37.8, n=32, FeO/MnO=27-40); feldspar: An56.8Ab42.0Or1.2, n=15

Classification: Martian (basaltic shergottite)

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2018
Mass (g):20
Pieces:4
Class:Martian (shergottite)
Shock stage:strong
Weathering grade:low
Ferrosilite (mol%):53.7; 26.2
Wollastonite (mol%):14.3; 32.2
Classifier:A. Greshake, MNB
Type spec mass (g):4.2
Type spec location:MNB
Main mass:Salamu Hamad
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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