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Northwest Africa 8588
Basic information Name: Northwest Africa 8588
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8588
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 1635 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 429 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 15 Nov 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8588 (NWA 8588)

(Northwest Africa)

Purchased: 2013 Jul

Classification: HED achondrite (Eucrite)

History: Purchased by Steve Witt in July 2013 from a Moroccan dealer.

Physical characteristics: Single large stone (1635 g) lacking fusion crust. The exterior consists of evenly-distributed, dark brown "knobby" regions and rounded, beige clasts (which have been preferentially corroded by wind terrestrial ablation and weathering processes).

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of mostly basaltic eucrite clasts plus some gabbroic eucrite clasts in a deep brown matrix. Exsolved pigeonite grains are stained orange and calcic plagioclase is polycrystalline. Accessory minerals include silica polymorph, Ti-bearing chromite, ilmenite, troilite and barite.

Geochemistry: Orthopyroxene host (Fs61.6-62.3Wo2.1-2.0, FeO/MnO = 29-30), clinopyroxene exsolution lamellae (Fs26.9-27.5Wo43.4-42.6, FeO/MnO = 29-30).

Classification: Eucrite breccia (shocked). The distinctive shock, mineralogical and weathering characteristics suggest that this stone is paired with NWA 7989 and related stones.

Specimens: 20.8 g including one polished thin section at UWB. The main mass is held by S. Witt.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013 Jul
Mass (g):1635
Pieces:1
Class:Eucrite
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):61.6-62.3; 26.9-27.5
Wollastonite (mol%):2.1-2.0; 43.4-42.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.8
Type spec location:UWB
Main mass:S. Witt
Comments:SW-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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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