header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 9 Aug 2019
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:
Limit to approved meteorite names
Search text:  
Northwest Africa 12564
Basic information Name: Northwest Africa 12564
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12564
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1918 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 190 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 3 May 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12564 (NWA 12564)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Martian meteorite (Shergottite)

History: Purportedly found in Mauritania and purchased in February 2019 by Jaouad Chaoui and Rachid Chaoui from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture (mean grainsize ~1 mm). Composed predominantly of complexly-zoned clinopyroxene and maskelynite with accessory titanomagnetite, ilmenite, chlorapatite, merrillite, and pyrrhotite. Myrmekitic intergrowths consisting of silica polymorph + relatively sodic plagioclase are associated with more calcic maskelynite and regions of K-rich glass containing blebs of pyrrhotite are also present.

Geochemistry: Subcalcic augite (Fs22.5-48.6Wo32.2-25.4, FeO/MnO = 30-36, N = 3), ferropigeonite (Fs65.5Wo15.9, FeO/MnO = 39), large maskelynite grains (An48.6-53.0Or2.3-2.0, N = 2), plagioclase in intergrowth with silica polymorph (An34.0Ab62.4Or3.6).

Classification: Shergottite (aphyric, diabasic).

Specimens: 26.5 g including one polished thin section at UWB; remainder held jointly by J. Chaoui and R. Chaoui.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):1918
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):22.5-48.6
Wollastonite (mol%):32.2-25.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26.5
Type spec location:UWB
Main mass:J. Chaoui/R. Chaoui
Comments:Work name RC110.1; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6846 approved meteorites from (Northwest Africa) (plus 2038 unapproved names)

Direct link to this page