Meteoritical Bulletin: Entry for Northwest Africa 8681

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Northwest Africa 8681

Basic information

Name: Northwest Africa 8681
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8681
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 590 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-br
Recommended:			Eucrite-br [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 13 Mar 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 8681 (NWA 8681)

(Northwest Africa)

Purchased: 2014 Jun

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Sergey Vasiliev from a Moroccan dealer at the Ensisheim Show in June 2014.

Physical characteristics: Single stone (590 g) with a light reddish-brown weathered exterior. The interior is dark gray with whitish clasts visible.

Petrography: (A. Irving and S. Kuehner), UWS) Breccia consisting of gabbroic eucrite clasts set in a very dark brown matrix containing related crystal debris plus minor unexsolved pigeonite. Gabbroic eucrite clasts are composed of exsolved pigeonite (commonly with wavy clinopyroxene exsolution lamellae), polycrystalline calcic plagioclase, silica polymorph, chromite, ilmenite and Ni-free metal. Secondary minerals from terrestrial weathering include, barite, calcite and iron hydroxides.

Geochemistry: Orthopyroxene host crystals (Fs_61.0-62.2Wo_4.4-2.1, FeO/MnO = 32-35, N = 3), clinopyroxene exsolution lamellae (Fs_26.8-28.3Wo_43.6-42.5, FeO/MnO = 30-33, N = 3), pigeonite (Fs_36.2Wo_5.6, FeO/MnO = 23).

Classification: Eucrite (brecciated). Likely paired with NWA 7989, NWA 8036, NWA 8588 and related stones.

Specimens: 24.8 g including one polished thin section at UWB; main mass with Mr. S. Vasiliev.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Ensisheim
Date:	P 2014 Jun
Mass (g):	590
Pieces:	1
Class:	Eucrite-br
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	61.0-62.2; 26.8-28.3
Wollastonite (mol%):	4.4-2.1; 43.6-42.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	24.8
Type spec location:	UWB
Main mass:	S. Vasiliev
Comments:	SVMJ14-1; 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, MAPS 55, 460-462

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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