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Northwest Africa 4486 | |||||||||||||
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Basic information | Name: Northwest Africa 4486 This is an OFFICIAL meteorite name. Abbreviation: NWA 4486 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: ![]() | ||||||||||||
Classification history: |
This is 1 of 11 approved meteorites classified as OC3. [show all] Search for other: Ordinary chondrites, Ordinary chondrites (type 3) | ||||||||||||
Comments: | Approved 24 Jul 2007 | ||||||||||||
Writeup![]() |
Writeup from MB 92:
Northwest Africa 4486 Morocco or Algeria Find: September 2005 Ordinary Chondrite (type 3) History: Purchased at the Denver Mineral Show by A. Hupé in September 2004. Physical characteristics: A single 21.3 g light brown stone lacking fusion crust and with abundant, small chondrules. Petrography: (A. Irving and S. Kuehner, UWS): Closely packed, round PO and POP chondrules (mean diameter 0.8 mm) with accessory, partially altered kamacite, troilite and pentlandite. The content of metal (+ minor Fe hydroxide) is very low (mode determined by BSE imaging of a whole thin section is 2 vol%). Geochemistry: Olivine (Fa5-29), orthopyroxene (Fs0.5-30Wo1.6). Oxygen Isotopes: (D. Rumble, CIW) analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ18O = 5.11, 5.51; δ17O = 3.15, 3.29; Δ17O = 0.465, 0.400 (all ‰). These oxygen isotopic compositions are closer to the TFL than those of H chondrites and far removed from those of LL chondrites. Classification: Ordinary chondrite (type 3); S1, W1/2. Specimens: A total of 4.6 g of sample and one polished thin section are on deposit at UWS. AHupé holds the main mass. | ||||||||||||
Data from: MB92 Table 2 Line 81: |
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Plots: | O isotopes: | ||||||||||||
Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |