Meteoritical Bulletin: Entry for Northwest Africa 8585

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Northwest Africa 8585

Basic information

Name: Northwest Africa 8585
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8585
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 293 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 11 Dec 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 8585 (NWA 8585)

(Northwest Africa)

Purchased: 2014 May

Classification: HED achondrite (Eucrite, polymict)

Petrography: (K. Metzler, IfP) Polymict achondritic breccia, consisting of eucritic lithic clasts (subophitic, gabbroic, granulitic) and mineral fragments (mostly pyroxene and plagioclase) set in a fine-grained clastic matrix of related debris. Clast-rich and clast-poor impact melt rocks occur in the sample. Most pyroxenes exhibit shock-deformed augite exsolution lamellae. Accessories are a silica polymorph, Cr-spinel, troilite, and Ni-free metal.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene (host): Fs_55.0±2.0Wo_4.6±1.8(Fs_51.9-58.7Wo_2.0-7.6); mean Fe/Mn (at.): 31.3; n=14. Ca-rich pyroxene (exsolution lamellae): Fs_24.6±1.7Wo_43.3±0.6(Fs_23.0-29.4Wo_41.7-44.2); n=13. Plagioclase: An_88.1±1.9Or_0.2±0.2(An_84.8-91.8Or_0.0-0.6); n=23.

Classification: Polymict eucrite, based on the variety of eucritic lithologies and the occurrence of various types of impact melt rocks.

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2014 May
Mass (g):	293
Pieces:	2
Class:	Eucrite-pmict
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	55.0±2.0; 24.6±1.7
Wollastonite (mol%):	4.6±1.8; 43.3±0.6
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Anonymous
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

Catalogs:

References:

Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?

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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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