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Northwest Africa 8658
Basic information Name: Northwest Africa 8658
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8658
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 141.4 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 344 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8658 (NWA 8658)

(Northwest Africa)

Purchased: Nov 2013

Classification: HED achondrite (Eucrite, polymict)

Petrography: (P. Warren, UCLA) This meteorite is a polymict eucrite with many distinct, sharply bounded clasts, including one that is uncommonly rich in silica. Minor Fe-metal.

Geochemistry: Clasts, and thus mineral compositions, are diverse. Pyroxene compositions extend to En65.1Wo5.6, En35.3Wo2.5, En30.5Wo43.4, En7.5Wo11.5 and En5.5Wo44.5; plagioclase ranges from An71 to An94, minor olivine from Fa62 to Fa87. Averages of the disparate clasts are: low-Ca pyroxene En50.4±12.2Wo7.6±1.7, FeO/MnO wt. ratio 30.1±1.2, n=28; med-Ca pyroxene En27.6±7.0Wo18.5±5.1, n=19; high-Ca pyroxene En20.4±6.5Wo39.0±4.5, n=8; plagioclase An85.0±5.7, n=97; olivine Fa80.3±4.5, n=30.

Classification: Eucrite (polymict).

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Nov 2013
Mass (g):141.4
Pieces:1
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):80.3
Ferrosilite (mol%):42.0
Wollastonite (mol%):7.6
Classifier:P. Warren, UCLA
Type spec mass (g):21.3
Type spec location:UCLA
Main mass:A. Jonikas
Comments:Submitted by P. Warren
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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