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Lewis Cliff 87109
Basic information Name: Lewis Cliff 87109
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87109
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  Iron
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: 4217
Writeuphelp
Writeup from AMN 12(3):

Sample No.: LEW87109

Location: Lewis Cliff

Dimensions (cm): 0.6x0.7x0.5

Field Number: 4217

Weight (g): 0.9

Meteorite Type: Iron

 

Macroscopic Description: Roy S. Clarke. Jr,

The specimen as received was a 0.86 g metal slug plus 0.03 g of debris, apparently mainly detached weathering products. Its shape was roughly equidimensional; and its surface was partially covered with various colored secondary oxides, with areas of tool marks from a previous examination, and with areas of metallic luster that may have developed by wind abrasion in Antarctica.

 

Polished Section Description: Roy S. Clarke. Jr.

A median section (0.174 g) was taken through the specimen, providing a polished section area of 0.25 cm2 for examination, and leaving two small butts (0.352 g, 0.174 g). Two small areas of remnant fusion crust were observed at section edges, as well as intermittent patches of secondary oxides. The oxide areas are generally less the 50 µm thick, with only an occasional small patch approaching a thickness of 100 µm. Patches of heat-altered kamacite are present near edges. The bulk metal is kamacite of somewhat variable Ni content. A small number of microprobe analyses averaged 6.3% Ni. The kamacite is rich in subboundaries that are decorated with fine precipitates below the limit of optical resolution. Neumann bands are present, generally decorated with fine precipitates. One 0.2 mm cracked schreibersite was observed.

Data from:
  MB76
  Table 2
  Line 3683:
Origin or pseudonym:Lower Ice Tongue
Mass (g):0.9
Class:Iron ung
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 12(3) (1989), 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° 15' 15"S, 161° 24' 30"E)
Note: the NHM and MetBase coordinates are 4.9 km apart

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