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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:help 286 g
Meteoritical Bulletin:  MB 99  (2011)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 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 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 Fs64.0±0.9 Wo3.2±1.1 Fe/Mn=31±1 N=8, clinopyroxene Fs29.4±2.0 Wo43.7±2.2 Fe/Mn=33±2 N=5, plagioclase Or0.6Ab11.0An88.4, 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:
  Table 0
  Line 0:
Place of purchase:Rissani, Morroco
Date:P 2002
Mass (g):286
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
   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)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Institute of Meteoritics UNM   

     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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