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Northwest Africa 11803
Basic information Name: Northwest Africa 11803
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11803
Observed fall: No
Year found: 2017
Country: Algeria
Mass:help 442 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 151 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11803 (NWA 11803)

Algeria

Purchased: 2017 Aug

Classification: HED achondrite (Eucrite, brecciated)

History: Purportedly found in Algeria and purchased by Gary Fujihara in August 2017 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of large gabbroic eucrite clasts in a very fine grained, vesicular quenched melt matrix containing angular mineral debris. Eucrite clasts (grainsize up to 2 mm) consist of exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, troilite and Ni-free metal. Pyroxenes in the matrix include both pigeonite and ferropigeonite.

Geochemistry: Gabbroic eucrite clasts: orthopyroxene host (Fs61.1Wo2.1, FeO/MnO = 33), clinopyroxene exsolution lamella (Fs27.3Wo42.4, FeO/MnO = 33), orthopyroxene host (Fs51.7Wo2.0, FeO/MnO = 35), clinopyroxene exsolution lamella (Fs20.3Wo44.5, FeO/MnO = 26), plagioclase (An91.3Or0.2). Matrix: pigeonite (Fs44.2Wo11.6, FeO/MnO = 32), ferropigeonite (Fs70.3Wo23.1, FeO/MnO = 38), plagioclase (An89.7Or0.2).

Classification: Eucrite (gabbroic, melt matrix breccia).

Specimens: 22 g including one polished thin section at UWB; remainder with Mr. G. Fujihara.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017 Aug
Mass (g):442
Pieces:1
Class:Eucrite-br
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):61.1; 27.3
Wollastonite (mol%):2.1; 42.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF18-2; 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. 107, in preparation (2018)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 771 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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