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Lewis Cliff 88023
Basic information Name: Lewis Cliff 88023
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88023
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  Iron
AMN 13(1)  (1990)  Iron w/silicate inclusions
AMN 17(1)  (1994)  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
Writeuphelp
Writeup from AMN 12(3):

Sample No.: LEW88023

Location: Lewis Cliff

Dimensions (cm): 2x1.5x0.4

Field Number: None

Weight (g): 8.0

Meteorite Type: Reheated octahedrite (?) with trace silicates

 

Macroscopic Description: Roy S. Clarke, Jr.

This specimen was not thought to be a meteorite in the field and was identified later by Randy Korotev at Washington University. Reddish-brown terrestrial oxides cover its surfaces. It is a flat oval with rounded edges, having one domed surface and a flat surface, suggesting a posterior and an anterior surfaces during oriented atmospheric flight.

 

Polished Section Description; Roy S. Clarke, Jr.

A thin slice was removed from one end of the specimen, perpendicular to its long axis, providing an area of approximately 0.5 cm2 for examination. The surface is mainly recrystallized kamacite containing 6.5% Ni, unusually low levels of P, and bordered by terrestrial oxides varying in width from 0.05 to 0.5 mm. The size of recrystallized kamacite areas are much smaller along the domed surface edge and at the ends of the slice, suggesting a heat-altered zone associated with an anterior surface. Interior recrystallization may have occurred prior to atmospheric passage. Very small amounts of heat-altered taenite are present, but insufficient surface area is available to establish the scale should a coarse Widmanst├Ątten pattern have existed. The kamacite contains tiny precipitates, particularly decorating subboundaries, that are too small to be identified. No clearly recognizable schreibersite was seen. Two areas containing chains of silicate inclusions were observed. Individual silicates are a few microns on an edge, with a total area of about 0.02 mm2. Pyroxene, olivine, and plagioclase were identified, as was an associated chromite of about 0.005 mm2. In surface repolishing the chromite was lost, but troilite was revealed as also being part of the association.

Data from:
  MB76
  Table 2
  Line 3880:
Mass (g):8
Class:Iron ung
Catalogs:
Search for specimens in the Smithsonian Institution collection (U.S.):   
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 12(3) (1989), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   Unknown

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

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