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Lewis Cliff 85369
Basic information Name: Lewis Cliff 85369
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85369
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  Iron
AMN 13(1)  (1990)  Iron-ung
Meteoritical Bulletin:  MB 76  (1994)  Iron-ung
NHM Catalogue:  5th Edition  (2000)  Iron-ung
MetBase:  v. 7.1  (2006)  Iron-ung
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 129 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Field number: 2013
Writeuphelp
Writeup from AMN 10(2):

Sample No.: LEW85369

Location: Lewis Cliff

Weight (g): 6.3

Field No.: 2013

Dimensions (cm): 1.5 x 1.5 x 0.8

Meteorite Type: Iron

 

Macroscopic Description: Roy S. Clarke, Jr.

This specimen is irregularly shaped, pitted, weathered, and covered with a reddish brown coating of secondary oxides.

 

Polished Section Description: Roy S. Clarke, Jr.

A median section through the individual provided an area of 0.8 cm2 for examination. The surface comprises a number of roughly equidimensional metal grains in the 1 to 3 mm size range. Two of these grains are martensite, containing subgrains of martensite bordered by thin, irregular bands of kamacite. The kamacite grains appear to be single crystal kamacite free of inclusions. The kamacite grains react differentially to nital etchant, some becoming very dark on brief exposure. Terrestrial weathering has penetrated into the center of the sample along major kamacite/kamacite grain boundaries and along cleavages. The external surface of the slice is bordered for the most part by about 0.1 mm of terrestrial weathering products. Small areas of remnant fusion crust remain within and under the weathering products. Interior to this and around most of the exterior surface is a heat-altered zone, up to 1.5 mm thick at one point. The thickest areas of heat-altered zone are at opposite ends of the section along its long axis, suggesting that this may have been an oriented individual during atmospheric passage.

Data from:
  MB76
  Table 2
  Line 2942:
Origin or pseudonym:Upper Ice Tongue
Mass (g):6.3
Class:Iron ung
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 16' 53"S, 161° 22' 37"E)
Note: the NHM and MetBase coordinates are 3.3 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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