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Northwest Africa 6600 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 6600 This is an OFFICIAL meteorite name. Abbreviation: NWA 6600 Observed fall: No Year found: 2010 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 617 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||
Comments: | Approved 27 Apr 2011 | ||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 99:
Northwest Africa 6600 (NWA 6600) Morocco 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: MB99 Table 0 Line 0: |
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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) Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:![]() |
Statistics: This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) |