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Northwest Africa 4661
Basic information Name: Northwest Africa 4661
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4661
Observed fall: No
Year found: 2005
Country: Algeria
Mass:help 42 g
Classification
  history:
Meteoritical Bulletin:  MB 93  (2008)  CK3
Recommended:  CK3    [explanation]

This is 1 of 37 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 1 Jan 2008
Revised 4 Aug 2008: final writeup
Writeuphelp
Writeup from MB 93:

Northwest Africa 4661

Algeria

Find: 2005

Carbonaceous chondrite (CK3)

History and Physical characteristics: A 42 g dark stone with partial fusion crust and deep, desert ablation etching was found in Algeria in 2005 and purchased in Rissani in 2006 by H. Burkard.

Petrography: (J. Wittke and T. Bunch, NAU) Fresh light gray interior with unusually large chondrules (up to 3 mm; mean = 0.95 mm) for a CK chondrite. Chondrules have sharply defined boundaries and contain clear glass. Inclusions of chlorapatite occur in matrix magnetite. Isotropic clumps of near plagioclase compositions are heterogeneously dispersed within the matrix.

Mineral compositions and Geochemistry: Olivine (Fa21.5- 37.4; FeO/MnO = 90-177), Ca-pyroxene (Fs9.1-14.2Wo45-49.7), plagioclase (An27.8-73.2; isotropic); magnetite (Cr2O3 = 1.79- 2.25 wt%, Al2O3 = 1.22-2.28 wt%, MgO = 0.25-0.42 wt%, NiO = 0.25-0.45 wt%.

Classification: Carbonaceous chondrite (CK3); minimal weathering and shock.

Type specimens: An 8.3 g sample is on deposit at NAU. Burkard owns the main mass.

Submitted by: T. Bunch, NAU.

Data from:
  MB93
  Table 2
  Line 89:
Place of purchase:Rissani, Morocco
Date:2005
Mass (g):42
Pieces:1
Class:CK3
Type spec mass (g):8.3
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Burkard: Horst Burkard, Bonn, Germany (private address)
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 961 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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