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Northwest Africa 3157
Basic information Name: Northwest Africa 3157
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3157
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 51.7 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 3157

Morocco or Algeria

Find: September 2004

Ordinary Chondrite (Type 3)

History: Purchased from a Moroccan dealer at the Denver Mineral Show by A. Hupé in September 2004.

Physical characteristics: A single 51.7 g light brown stone lacking fusion crust and with abundant, large chondrules.

Petrography: (A. Irving and S. Kuehner, UWS): Closely packed PO and POP chondrules (mean diameter 1.0 mm); some are ovoid. The matrix is a "lacework" of porous olivine and pyroxene with accessory kamacite, taenite and troilite. The content of metal (+ minor Fe hydroxide) is very low (mode determined by BSE imaging of a whole thin section is 1 vol.%).

Geochemistry: Olivine (Fa0-60); orthopyroxene (Fs0.5-30Wo1.5) Oxygen Isotopes: (D. Rumble, CIW) Analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ18O = 5.30, 4.85; δ17O = 3.48, 3.29; Δ17O = 0.693, 0.742 (all ‰). Although these Δ17O values are within the range for H chondrites, this specimen is poorer in metal than typical H chondrites.

Classification: Ordinary chondrite (Type 3); S2, W1/2.

Specimens: A total of 10.6 g of sample and one polished thin section are on deposit at UWS. Hupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 8:
Place of purchase:Denver, Colorado USA
Date:2004
Mass (g):51.7
Pieces:1
Class:OC (type 3)
Type spec mass (g):10.6
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)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
jean bernard Delbauve   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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