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Northwest Africa 6601
Basic information Name: Northwest Africa 6601
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6601
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 276 g
Meteoritical Bulletin:  MB 99  (2011)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 605 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Apr 2011
Writeup from MB 99:

Northwest Africa 6601 (NWA 6601)


Found: October 2010

Classification: HED achondrite (Eucrite)

History: Found near Mhamid, Morocco, in October 2010. Purchased in Tucson, AZ, in January 2011 by Thompson.

Physical characteristics: Three fragments that fit together into one mass of 276.2 g. Light-gray exterior with minor iron staining. Interior shows light-gray matrix crosscut by numerous dark-gray veins to 3 mm. Metal grains visible.

Petrography: (C. Agee, UNM). Thin sections reveals low- and high-Ca pyroxene (~60%) and plagioclase feldspar (30%), with silica, Cr-spinel, ilmenite, troilite, and Fe-metal; olivine absent. Pyroxene and plagioclase to 500 μm. Some areas resemble fine-grained cataclastite. Pyroxene shows exsolution lamellae and planar parting, fracturing, and microfaulting. Some plagioclase as large laths, some transitioning into impact melt. Equant to irregular Fe-metal grains to 300 μm. Troilite commonly fine grained. Numerous impact melt veins and pockets to 500 μm, containing abundant silica, troilite and rafted basaltic clasts.

Geochemistry: (C. Agee and M. Spilde, UNM) Equilibrated, brecciated, main group eucrite permeated with shock melt. Orthopyroxene Fs61.2±0.9Wo3.7±1.0, Fe/Mn=29 ± 1, n=7, clinopyroxene Fs26.6±1.0Wo44.5±0.8, Fe/Mn=30 ± 2, n=4, plagioclase Or0.5Ab10.1An89.4, shock melt veins SiO2 = 48.2 ± 1.6 wt%, CaO/Al2O3 (wt%)=0.64, Mg# = 0.37 ± 0.01, TiO2 = 0.61 ± 0.37 wt%, n=7. Metal Ni<0.01 wt% Co=0.04 ± 0.02 wt%, n=5.

Classification: Achondrite (eucrite); low weathering grade, high shock grade, numerous impact melt veins and pools present.

Specimens: Thompson holds the main mass, type specimen of 22 g on deposit at UNM.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:October 2010
Mass (g):276.2
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):61.2±0.9; 26.6±1.0
Wollastonite (mol%):3.7±1.0; 44.5±0.8
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Thompson
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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (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 2089 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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