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Northwest Africa 6600
Basic information Name: Northwest Africa 6600
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6600
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 439 g
Meteoritical Bulletin:  MB 99  (2011)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 617 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 27 Apr 2011
Writeup from MB 99:

Northwest Africa 6600 (NWA 6600)


Found: 2010

Classification: Ureilite

History: A single mass was found just south of Erfoud, Morocco, in December 2010.

Physical characteristics: Dark, coarsely granular surface. Interior shows a mosaic of green and brown olivine and pyroxene with grain sizes 1-3 mm; grain boundaries do not take a polish; some iron staining present.

Petrography: (C. Agee, UNM) Thin section shows approx. 75% olivine and 20% pigeonite, with numerous Fe-Ni-metal veins occupying grain boundaries and crosscutting silicates. Many of the veins have been oxidized. The metal veins are commonly haloed by tiny metal blebs grading into adjacent olivine crystals. The primary population of olivine and pigeonite crystals are 1-3 mm, with few inclusions, while smaller olivine grains 50-200 μm are often riddled with metal blebs and opaque intergrowths. Graphite may be present at grain boundaries. A single, small, Cr-rich sulfide was observed.

Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. Olivine cores Fa21.0±0.7, Fe/Mn = 45 ± 4, Cr2O3 = 0.71 ± 0.01 wt%, n=6, small olivines at grain boundaries near metal blebs and possible graphite Fa8.7±1.2, Fe/Mn = 16 ± 2 Cr2O3 = 0.76 ± 0.04 wt%, n=2, pigeonite (cores and rims) Fs18.1 +/- 0.2Wo8.6 +/- 0.1, Fe/Mn = 27 ± 1, Cr2O3 = 1.15 ± 0.02 wt%, n=7, metal (wt%) Fe = 95.30 ± 0.50, Ni = 4.04 ± 0.38, Co = 0.37 ± 0.05, n=4, Cr-rich Fe-sulfide (wt%) Fe = 49.15, Cr = 9.99, S = 37.99.

Classification: achondrite (ureilite)

Specimens: Thompson holds the main mass, type specimen of 25.2 g total, 1.1 g fragment cast in epoxy for microprobe analysis, on deposit at UNM.

Data from:
  Table 0
  Line 0:
Mass (g):439
Fayalite (mol%):21.0±0.7; 8.7±1.2
Ferrosilite (mol%):18.1±0.2
Wollastonite (mol%):8.6±0.1
Classifier:C. Agee, UNM
Type spec mass (g):25.2
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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     This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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