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Northwest Africa 4531
Basic information Name: Northwest Africa 4531
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4531
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 38.9 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  OC3
Recommended:  OC3    [explanation]

This is 1 of 10 approved meteorites classified as OC3.   [show all]
Search for other: Ordinary chondrites, Ordinary chondrites (type 3)
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4531

Morocco or Algeria

Find: September 2005

Ordinary chondrite (type 3)

History: Purchased at the Denver Mineral Show by A. Hupé in September 2005.

Physical characteristics: Three light brown stones (total weight 38.9 g) lacking fusion crust and with abundant, large chondrules.

Petrography: (A. Irving and S. Kuehner, UWS): Closely packed PO and POP chondrules with a mean diameter 1.0 mm. Chondrules containaccessory phases such as partially altered kamacite, taenite and troilite. The content of metal (+ minor Fe hydroxide) = 2 vol%.

Geochemistry: Olivine (Fa4-27) Oxygen Isotopes: (D. Rumble, CIW) Analysis of an acid-washed whole rock sample by laser fluorination gave δ18O = 5.25, δ17O = 3.47, Δ17O = 0.709 (all ‰). Although these Δ17O values are within the range for H chondrites, this specimen is much too poor in metal to be an H chondrite.

Classification: Ordinary chondrite (type 3); S1, W1/2.

Specimens: A total of 7.8 g of sample and one polished thin section are on deposit at UWS. AHupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 91:
Place of purchase:Denver, Colorado, USA
Date:Sept-2005
Mass (g):38.9
Pieces:1
Class:OC (type 3)
Type spec mass (g):7.8
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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