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Northwest Africa 12265
Basic information Name: Northwest Africa 12265
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12265
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 4.43 kg
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 26 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12265 (NWA 12265)

(Northwest Africa)

Purchased: 2015 Jan

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased in Rissani, Morocco by Adam Aaronson in January 2015.

Petrography: (A. Irving and S. Kuehner, UWS) Composed predominantly of a vesicular quenched melt rock lithology enclosing sparse remnant clasts of shocked gabbroic eucrite. The fine grained melt rock lithology consists of aluminous pigeonite (with two distinct Fe/Mg ratios) and calcic plagioclase with accessory Ti-poor chromite, Cr-ulvöspinel and troilite. Gabbroic eucrite clasts contain recrystallized pigeonite and polycrystalline calcic plagioclase with minor fayalite, silica polymorph, Ti-poor chromite, Ti-chromite, trolite and minor barite.

Geochemistry: Pigeonite (Fs31.2-38.4Wo12.0-17.1, FeO/MnO = 26-28, Al2O3 = 2.3-5.7 wt.%, N = 3), ferroan pigeonite (Fs56.6-58.7Wo16.8-19.6, FeO/MnO = 32-33, Al2O3 = 0.8-1.1 wt.%), fayalite (Fa80.4-80.8, FeO/MnO = 45-47, N = 2), plagioclase (An88.0-89.9Or0.4-0.8, N = 2).

Classification: Eucrite (vesicular, shock-melted breccia).

Specimens: 20.6 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Rissani
Date:P 2015 Jan
Mass (g):4433
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Fayalite (mol%):80.4-80.8
Ferrosilite (mol%):31.2-58.7
Wollastonite (mol%):12.0-19.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.6
Type spec location:UWB
Main mass:A. Aaronson
Comments:Work name M1796; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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