Meteoritical Bulletin: Entry for Northwest Africa 8588

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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: 1635 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 15 Nov 2014

Writeup

help

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 (Fs_61.6-62.3Wo_2.1-2.0, FeO/MnO = 29-30), clinopyroxene exsolution lamellae (Fs_26.9-27.5Wo_43.4-42.6, 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

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:

Credit	Photos
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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