Meteoritical Bulletin: Entry for Northwest Africa 8611

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Northwest Africa 8611

Basic information

Name: Northwest Africa 8611
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8611
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 32.7 g

Classification
history:

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

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 13 Dec 2014

Writeup

Writeup from MB 103:

Northwest Africa 8611 (NWA 8611)

(Northwest Africa)

Purchased: 23 June 2012

Classification: HED achondrite (Eucrite)

History: Purchased at Sainte-Marie-aux-Mines Mineral Show from a Moroccan mineral dealer

Petrography: This meteorite shows a highly brecciated texture consisting of granular clast (20%), basaltic clast (20%), and fine-grained matrix (60%). All these lithologies display nearly the same modal abundances of minerals, 47% plagioclase, 40% pyroxene (orthopyroxene with augite), and 6% a silica mineral, with chromite, ilmenite and rare troilite. Plagioclase typically shows lath-shaped morphology, and does not show zoning. Pyroxenes do not contain lamellae, and are homogeneous in composition. Some silica grains are identified as cristobalite.

Geochemistry: Plagioclase An_88±0.8(n=30); orthopyroxene, Fs_60.8±0.7Wo_2.0±0.2(n=30, FeO/MnO=32.8); augite, Fs_26.2±0.7Wo_43.5±0.6(n=10).

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Sainte-Marie-aux-Mines
Date:	P 23 June 2012
Mass (g):	32.7
Pieces:	1
Class:	Eucrite
Ferrosilite (mol%):	60.8±0.7; 26.2±0.7
Wollastonite (mol%):	2.0±0.2; 43.5±0.6
Classifier:	A. Asahina, T. Noguchi, M. Kimura, Ibaraki
Type spec mass (g):	7.3
Type spec location:	NMNS
Main mass:	Hori Mineraology, Japan
Comments:	Field name: HM12-2; submitted by Makoto Kimura

Institutions
and collections

NMNS: National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, JAPAN, Japan; Website (institutional address; updated 16 Jun 2014)
Ibaraki: Department of Materials and Biological Sciences, Institute of Astrophysics and Planetary Science, Ibaraki University, 2-1-1 Bunkyo, Mito 310-8512, Japan (institutional address; updated 27 Feb 2011)
Hori: Unknown person (private address; updated 17 Apr 2009)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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