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Lewis Cliff 88055
Basic information Name: Lewis Cliff 88055
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88055
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 13(3)  (1990)  Iron-an
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
Comments: Field number: 4160
Writeuphelp
Writeup from AMN 13(3):

Sample No. LEW88055

Location: Lewis Cliff

Dimensions (cm): 1.2 x 0.8 x 0.5

Field Number: 4160

Weight (g): 1.7

Meteorite Type: Anomalous iron containing silicates

 

Macroscopic Description: Roy S. Clarke. Jr.

Irregular shaped nodule covered with a dark brown oxide coating containing patches of both darker and lighter colored material. The surface appearance suggested that the specimen might not be all metal.

 

Thin Section Description: Roy S. Clarke. Jr.

A median slice of 116 mg was removed for section preparation, leaving butts of 383 and 901 mg, and a chip of 30 mg. The surfaces of the slice and butts contained 30 to 40 area percent silicates. The slice was made into a polished thin section containing several mm-size silicate areas. The only silicate mineral recognized on preliminary optical and electron microprobe examination was a fairly coarse-grained magnesian enstatite. Iron in the few tenths percent range was present in some analyses, but its concentration correlated with the intensity of iron staining due to terrestrial weathering. The metal matrix is a Si-free kamacite containing a high concentration of Neumann bands, many of which are distorted. The kamacite within 1 mm of about two-thirds of the exterior edge has been transformed to α2 by atmospheric ablation. Three very small taenite areas containing martensitic plessite are clustered along a part of the edge that is not heat altered. They are associated-with grain boundary schreibersite. These observations suggest that the specimen is anomalous.

 

Data from:
  MB76
  Table 2
  Line 3912:
Origin or pseudonym:Lower Ice Tongue
Mass (g):1.7
Class:Iron ung
Fayalite (mol%):¾
Ferrosilite (mol%):0
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 13(3) (1990), 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° 14' 45"S, 161° 26' 40"E)
Note: the NHM and MetBase coordinates are 5.8 km apart

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