Meteoritical Bulletin: Entry for Northwest Africa 8583

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Northwest Africa 8583

Basic information

Name: Northwest Africa 8583
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8583
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 640 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 409 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 10 Mar 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 8583 (NWA 8583)

(Northwest Africa)

Purchased: 2014 Jun 25

Classification: HED achondrite (Eucrite, polymict)

History: Purchased from a moroccan meteorite dealer in Sainte-Marie aux Mines

Petrography: (K. Metzler, IfP) Chemically different basaltic and granulitic eucrite clasts and mineral fragments set in a brownish matrix. The matrix represents a crystallized melt, consisting of tiny pyroxene and plagioclase crystals. Plagioclase fragments are polycrystalline, some showing fluidal textures. Small amounts of maskelynite. Most pyroxene fragments show augite exsolution lamellae. Accessories are ilmenite, chromite, silica polymorph and isolated olivine fragments.

Geochemistry: Low-Ca pyroxene: Fs_{62.0±4.94.2±1.9}(Fs_54-68Wo_2-9, Fe/Mn=29, n=15). Augite lamellae: Fs_29.2±2.9Wo_42.9±0.7(Fs_23-32Wo_41-44, Fe/Mn=31, n=14). Plagioclase: An_89.2±1.9(An_86-92; n=10). Isolated olivine grains: Fa_71-83, Fe/Mn=40, n=4.

Classification: Polymict eucrite (clast-rich melt rock)

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Sainte-Marie aux Mines
Date:	P 2014 Jun 25
Mass (g):	640
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	71-83
Ferrosilite (mol%):	62.0±4.9; 29.2±2.9
Wollastonite (mol%):	4.2±1.9; 42.9±0.7
Classifier:	K. Metzler, IfP
Type spec mass (g):	20g
Type spec location:	IfP
Main mass:	E. and U. Eger, Bochum, Germany
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 Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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