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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
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 241 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Jan 2021
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):135
Pieces:1
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
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:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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