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| Northwest Africa 4650 | |||||||||||||
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| Basic information | Name: Northwest Africa 4650 This is an OFFICIAL meteorite name. Abbreviation: NWA 4650 Observed fall: No Year found: 2006 Country: Algeria Mass:  339 g | ||||||||||||
| Classification history: |
This is 1 of 130 approved meteorites classified as EL6. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites | ||||||||||||
| Comments: |
Approved 1 Jan 2008 Revised 4 Aug 2008: final writeup | ||||||||||||
| Writeup |
Writeup from MB 93:
Northwest Africa 4650 Algeria Find: 2006 Enstatite chondrite (EL6) History and Physical characteristics: A single 339 g stone was found in the southern Algerian desert in 2006 and purchased in Erfoud, Morocco, in July 2006. The stone is moderately weathered on the surface and somewhat flaky with little remaining fusion crust. Petrography: (T. Bunch and J. Wittke, NAU) Highly recrystallized with rare, barely discernible chondrule fragments. Very high metal content (28 vol%) that is distributed throughout the matrix as small (<0.5 mm) irregularly shaped grains, as large blobs (2-4 mm), and as coarse grains (~1 mm) in metal-rich recrystallized veins. Graphite is commonly included in large metal grains. Mineral compositions and Geochemistry: Enstatite (Fs0-0.7; many grains have <0.02 wt% FeO), plagioclase (An17.4), metal (Ni = 5.6-6.4 wt%; Si = 1.15 wt%), FeS (Cr = 1.84 wt%; Ti = 1.18 wt%), oldhamite (Fe = 0.65 wt%; Mn = 0.92 wt%; Mg = 0.48 wt%), daubreelite (Cr = 35.6 wt%; Fe = 15.3 wt%; Mn = 3.5 wt%), alabandite (Mn = 3.3 wt%; Mg = 4.9 wt%) together with small niningerite and SiC grains. Classification: Enstatite chondrite (EL6). Type specimens: A 24.1 g sample is on deposit at NAU. Aaronson holds the main mass. Submitted by: T. Bunch, NAU. | ||||||||||||
| Data from: MB93 Table 2 Line 86: |
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| Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Geography:
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Statistics: This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||