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Northwest Africa 12243
Basic information Name: Northwest Africa 12243
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12243
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 164 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 332 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12243 (NWA 12243)

Mauritania

Purchased: 2018 May

Classification: HED achondrite (Eucrite, polymict)

History: Found in Mauritania and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh breccia specimen consisting of larger angular mineral clasts derived mostly from gabbroic eucrites in a finer matrix of the same phases. Minerals are exsolved pigeonite, anorthite, silica polymorph, unexsolved ferroan pigeonite, minor (<10 vol.%) diogenitic orthopyroxene, olivine, ilmenite, chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs27.9-29.0Wo2.1-3.6, FeO/MnO = 27-28, N = 2), olivine (Fa42.3-51.0, FeO/MnO = 50, N = 2), low-Ca pyroxene host in exsolved pigeonite (Fs43.5-45.9Wo2.6-5.5, FeO/MnO = 27-34, N = 2), clinopyroxene exsolution lamella (Fs17.7Wo44.2, FeO/MnO = 26), subcalcic augite (Fs62.5Wo26.0 FeO/MnO = 34), anorthite (An91.5-93.9Or0.6-0.5, N = 2).

Classification: Eucrite (polymict breccia).

Specimens: 20.1 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 May
Mass (g):164
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Fayalite (mol%):42.3-51.0
Ferrosilite (mol%):27.9-29.0; 43.5-45.9
Wollastonite (mol%):2.1-3.6; 2.6-5.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 365; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 94 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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