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Northwest Africa 13645
Basic information Name: Northwest Africa 13645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13645
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 135 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Jan 2021
Writeup from MB 110:

Northwest Africa 13645 (NWA 13645)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Dark grayish rock without fusion crust.

Petrography: The meteorite displays a dark-grayish interior and has a fine-grained gabbroic texture predominantly composed of up to 700 µm sized calcic pyroxene and often lath-shaped maskelynite grains both showing irregular compositional zoning. Slightly zoned Fe-rich olivine is a minor phase and often contains magmatic inclusions. Accessories include ilmenite, ulvospinel, pyrrhotite, and merrillite. The meteorite is highly shocked and contains shock melt veins and pockets. Calcite-filled veins and secondary barite indicate a severe degree of terrestrial alteration.

Geochemistry: complex zoned pyroxene: Fs29.9±5.4Wo10.3±2.8 (Fs22.6-40.3Wo3.7-14.1, FeO/MnO=30±3, n=19); olivine: Fa40.8±1.6 (Fa38.5-43.7, FeO/MnO=55±2, n=10); maskelynite: An65.2±2.4Ab34.4±2.4Or0.4±0.1 (An61.3-69.6Ab30.0-38.3Or0.2-0.6, n=18)

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):135
Class:Martian (shergottite)
Shock stage:high
Weathering grade:high
Fayalite (mol%):40.8
Ferrosilite (mol%):29.9
Wollastonite (mol%):10.3
Classifier:A. Greshake, MNB
Type spec mass (g):20.1
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
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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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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