Meteoritical Bulletin: Entry for Northwest Africa 8564

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Northwest Africa 8564

Basic information

Name: Northwest Africa 8564
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8564
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 1335 g

Classification
history:

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

This is 1 of 54 approved meteorites classified as Eucrite-cm. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 17 Oct 2014

Writeup

Writeup from MB 103:

Northwest Africa 8564 (NWA 8564)

(Northwest Africa)

Found: 2013

Classification: HED achondrite (Eucrite, cumulate)

History: Found 2013 in Morocco, purchased by Dave Gheesling in Erfoud, Morocco.

Physical characteristics: Single stone, weathered fusion crust exterior. Aaw cut reveals a gabbroic texture with white feldspar and green pyroxene grains, some pockets with coarser grains up to cm-size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount reveals an approximately equal mix of gabbroic pyroxene and plagioclase crystals. Fe-metal, troilite, chromite, and silica present.

Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs_39.9±1.5Wo_8.5±1.1, Fe/Mn=27±1, n=23; plagioclase An_93.3±1.8Ab_6.6±1.8Or_0.2±0.0, n=7.

Classification: Achondrite (cumulate eucrite), low weathering grade.

Specimens: 27.2 g including a probe mount on deposit at UNM, Dave Gheesling holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	2013
Mass (g):	1335
Pieces:	1
Class:	Eucrite-cm
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	39.9 ±1.5
Wollastonite (mol%):	8.5 ±1.1
Classifier:	C. Agee, UNM
Type spec mass (g):	27.2
Type spec location:	UNM
Main mass:	Dave Gheesling
Comments:	Field name DG-2; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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