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Northwest Africa 4650
Basic information Name: Northwest Africa 4650
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4650
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 339 g
Classification
  history:
Meteoritical Bulletin:  MB 93  (2008)  EL6
Recommended:  EL6    [explanation]

This is 1 of 120 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
Writeuphelp
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:
Place of purchase:Algeria/Erfoud Morocco,
Date:06-Jul-08
Mass (g):339
Pieces:1
Class:EL6
Type spec mass (g):24.1
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1015 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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