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Northwest Africa 4486
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:help 21.3 g
Meteoritical Bulletin:  MB 92  (2007)  OC3
Recommended:  OC3    [explanation]

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 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:
  Table 2
  Line 81:
Place of purchase:Denver, Colorado, USA
Mass (g):21.3
Class:OC (type 3)
Type spec mass (g):4.6
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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     This is 1 of 9765 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)

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