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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
Meteoritical Bulletin:  MB 110  (2022)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 318 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 18 Jun 2021
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:
  Table 0
  Line 0:
Place of purchase:Temara, Morocco
Date:P 2021 Jan
Mass (g):10
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
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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    (Caution, these are of unknown reliability)
Said Yousfi      

     This is 1 of 9570 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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