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Northwest Africa 4661 | |||||||||||||
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Basic information | Name: Northwest Africa 4661 This is an OFFICIAL meteorite name. Abbreviation: NWA 4661 Observed fall: No Year found: 2005 Country: Algeria Mass: 42 g | ||||||||||||
Classification history: |
This is 1 of 86 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 | ||||||||||||
Writeup |
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: |
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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) Burkard: Horst Burkard, Bonn, Germany (private address) |
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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: |
Statistics: This is 1 of 1358 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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