header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 Sep 2023
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
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 300 approved meteorites (plus 2 unapproved names) 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 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
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

Direct link to this page