Meteoritical Bulletin: Entry for Northwest Africa 8562

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Northwest Africa 8562

Basic information

Name: Northwest Africa 8562
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8562
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 510 g

Classification
history:

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

This is 1 of 127 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 12 Oct 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8562 (NWA 8562)

(Northwest Africa)

Purchased: 2014

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Abdelhadi Aithiba in Morocco, 2014.

Physical characteristics: Single stone, smooth, black, weathered fusion crust exterior, one side showing rough secondary fusion crust surface.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount reveals approximately 60% pyroxene and 35% plagioclase, pyroxenes show igneous zoning, many are aggregates of ~50 μm grains in cm-sized clusters. Both pyroxene and plagioclase occur as poikiloblasts. Fayalitic olivine present. Ubiquitous troilite, ilmenite, and silica. Unbrecciated.

Geochemistry: (C. Agee and N. Muttik, UNM) Pyroxene Fs_50.0±6.4Wo_12.3±4.1, Fe/Mn=31±2, n=22; pyroxene ranges from pigeonite Fs_41.6Wo_8.4En_50.0to ferro-augite Fs_61.4Wo_22.6En_16.0; olivine Fa_85.9±0.9, Fe/Mn=43±1, n=5; plagioclase An_90.3±0.4Ab_9.0±0.3Or_0.6±0.1, n=5.

Classification: Eucrite (unequilibrated basaltic, unbrecciated). Presence of metastable ferro-augite, and the pronounced pyroxene Fe-enrichment trend is consistent with Type 1 eucrites (Takeda and Graham, 1991).

Specimens: 22.0 g including a probe mount on deposit at UNM, Abdelhadi Aithiba holds the main mass.

Bibliography:

H. Takeda and A.L. Graham (1991) Degree of equilibration of eucritic pyroxenes and thermal metamorphism of the earliest planetary crust. Meteoritics 26 129-134. (link)

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2014
Mass (g):	510
Pieces:	1
Class:	Eucrite-unbr
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	50.0±6.4
Wollastonite (mol%):	12.3±4.1
Classifier:	C. Agee, UNM
Type spec mass (g):	22.0
Type spec location:	UNM
Main mass:	Abdelhadi Aithiba
Comments:	Submitted by C. Agee

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

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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