Meteoritical Bulletin: Entry for Northwest Africa 6589

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Northwest Africa 6589

Basic information

Name: Northwest Africa 6589
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6589
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass: 286 g

Classification
history:

Meteoritical Bulletin:	MB 99	(2011)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 7 Apr 2011

Writeup

help

Writeup from MB 99:

Northwest Africa 6589 (NWA 6589)

(Northwest Africa)

Purchased: 2002

Classification: HED achondrite (Eucrite)

History: Purchased by Bruno Fectay and Carine Bidaut in Rissani, Morocco, 2002. Institute of Meteoritics (UNM) acquired the unclassified sample in 2011.

Physical characteristics: Single, 286 g, fusion-crusted stone. Numerous centimeter-sized regmaglypts. Interior is light gray and fine-grained, with thin black melt veins.

Petrography: (C. Agee, UNM) Consists of low-Ca pyroxene, high-Ca pyroxene (total pyroxene ~60%) and plagioclase feldspar (35%), with ubiquitous Cr-spinel, ilmenite, and troilite, no Fe-Ni metal or olivine. Pyroxene shows exsolution lamellae. Plagioclase occurs both as equant grains and laths. Two textural domains dominated by coarser (20 to 100 μm) and finer (5 to 20 μm) pyroxene and plagioclase. Contact between domains is sharp; brecciation absent. Several crosscutting (50 to 100 μm) silicate melt veins.

Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. This is an equilibrated eucrite. Low-Ca pyroxene Fs_64.0±0.9Wo_3.2±1.1Fe/Mn=31±1 N=8, clinopyroxene Fs_29.4±2.0Wo_43.7±2.2Fe/Mn=33±2 N=5, plagioclase Or_0.6Ab_11.0An_88.4, silicate melt veins SiO₂=47.4±1.9 wt%, CaO/Al₂O₃ (wt%)=0.81, Mg#=0.36±0.01, TiO₂=0.71±0.05 wt%, consistent with the Nuevo Laredo trend.

Classification: Achondrite (Eucrite); minimal weathering, low shock grade, but melt veins present.

Specimens: UNM holds the main mass.

Data from:
  MB99
  Table 0
  Line 0:

Place of purchase:	Rissani, Morroco
Date:	P 2002
Mass (g):	286
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	minimal
Ferrosilite (mol%):	64.0±0.9, 29.4±2.0
Wollastonite (mol%):	3.2±1.1, 43.7±2.2
Classifier:	C. Agee
Type spec mass (g):	286
Type spec location:	UNM
Main mass:	UNM
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)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Institute of Meteoritics UNM

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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