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Northwest Africa 13938
Basic information Name: Northwest Africa 13938
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13938
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 10 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 260 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 18 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13938 (NWA 13938)

(Northwest Africa)

Purchased: 2021 Jan

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased from a dealer in Temara, Morocco.

Physical characteristics: Three small light-grayish fragments with minor fusion crust.

Petrography: Coarse-grained igneous rock predominantly composed of up to 1.3 mm sized pyroxene and olivine grains and less abundant interstitial maskelynite. Pyroxene shows strong irregular compositional zoning. Olivine is only weakly zoned and often contains small magmatic inclusions with radial cracks extending in the host crystals. Minor phases include chromite (with variable Cr/Ti-ratios), ilmenite, troilite, and merrillite. Some cracks are filled with secondary calcite. The meteorite is highly shocked and contains shock melt veins and pockets.

Geochemistry: pyroxene: Fs18.1±3.7Wo22.2±11.5 (Fs12.6-24.8Wo6.7-39.3, FeO/MnO=23±2, n=21); olivine: Fa28.0±0.7 (Fa26.9-28.8, FeO/MnO=44±2, n=13); plagioclase: An57.8±1.0Ab40.5±1.0Or1.7±0.2 (An55.8-59.3Ab39.0-42.6Or1.4-2.2, n=14)

Classification: Shergottite (olivine gabbroic).

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Temara, Morocco
Date:P 2021 Jan
Mass (g):10
Pieces:3
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):28.0
Ferrosilite (mol%):18.1
Wollastonite (mol%):22.2
Classifier:A. Greshake, MNB
Type spec mass (g):2
Type spec location:MNB
Main mass:Said Yousfi
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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