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Northwest Africa 13775
Basic information Name: Northwest Africa 13775
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13775
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 30 g
Meteoritical Bulletin:  MB 110  (2022)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 329 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Mar 2021
Writeup from MB 110:

Northwest Africa 13775 (NWA 13775)

(Northwest Africa)

Purchased: 2021 Jan

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased by the main mass holder from a dealer in Temara, Morocco.

Physical characteristics: Many small, light-brownish fragments without fusion crust.

Petrography: The meteorite shows a porphyritic texure of up to 1.3 mm sized strongly zoned olivine phenocrysts set in a groundmass of zoned pigeonite and maskelynite. Olivine often contains magmatic inclusions with radial cracks extending into the host. Minor minerals are small homogeneous olivine, chromite, ilmenite, and pyrrhotite. Contains shock melt veins.

Geochemistry: olivine phenocrysts: Fa40.9±13.6 (Fa27.0-60.3, FeO/MnO=47±3, n=9); small olivine: Fa45.7±0.1, FeO/MnO=47±2, n=3; complex zoned pyroxene: Fs33.0±9.5Wo18.6±11.7 (Fs23.4-46.8Wo5.3-43.1, FeO/MnO=29±3, n=8); maskelynite: An51.3±2.6Ab46.8±2.3Or1.9±0.3 (An47.8-55.0Ab43.6-49.9Or1.3-2.3, n=8)

Classification: Martian; olivine-phyric shergottite

Data from:
  Table 0
  Line 0:
Place of purchase:Temara, Morocco
Date:P 2021 Jan
Mass (g):30
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):40.9; 45.7
Ferrosilite (mol%):33.0
Wollastonite (mol%):18.6
Classifier:A. Greshake, MNB
Type spec mass (g):6.8
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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Said Yousfi   
Public domain photographs:
Ansgar Greshake   

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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