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Northwest Africa 12006
Basic information Name: Northwest Africa 12006
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12006
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 630 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 167 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 20 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12006 (NWA 12006)

(Northwest Africa)

Purchased: 2018 Apr

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Marc Jost in April 2018 from a dealer in Laayoune, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of at least five different varieties of lithic eucrite clasts exhibiting a range of textures, grainsizes and degree of shock set within a matrix of related debris and minor secondary calcite. Minerals present include exsolved pigeonite, calcic plagioclase (unshocked in some clasts, undulose to polycrystalline in other clasts), silica polymorph, fayalitic olivine, Ti-chromite, ilmenite and troilite.

Geochemistry: Orthopyroxene host (Fs60.9-62.4Wo2.1-1.7, FeO/MnO = 33-34, N = 3), clinopyroxene exsolution lamellae (Fs27.0-27.3Wo42.8-43.6, FeO/MnO = 30-31, N = 2), fayalitic olivine (Fa81.2-81.3, FeO/MnO = 41-42, N = 2), plagioclase (An83.4-89.9Or1.2-0.4, N = 2).

Classification: Eucrite (brecciated).

Specimens: 27.7 g including one polished thin section at UWB; remainder held by SJS.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Laayoune
Date:P 2018 Apr
Mass (g):630
Pieces:1
Class:Eucrite-br
Shock stage:medium
Weathering grade:low
Fayalite (mol%):81.2-81.3
Ferrosilite (mol%):60.9-62.4; 27.0-27.3
Wollastonite (mol%):2.1-1.7; 42.8-43.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.7
Type spec location:UWB
Main mass:M. Jost
Comments:Work name SJS18007; 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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
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 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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