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Lewis Cliff 88432
Basic information Name: Lewis Cliff 88432
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88432
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  H-metal
Meteoritical Bulletin:  MB 76  (1994)  H-metal
NHM Catalogue:  5th Edition  (2000)  H
MetBase:  v. 7.1  (2006)  H-metal
Recommended:  H-metal    [explanation]

This is 1 of 8 approved meteorites classified as H-metal.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Metal-rich meteorites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Field number: 5236
Writeuphelp
Writeup from AMN 14(2):

Sample No: LEW88432

Location: Lewis Cliff

Field Number : 5236

Dimensions (cm): 1.1 x 1.1 x 0.25

Weight (g): 1.3

Meteorite Type: Metal from an H chondrite.

 

Macroscopic Description: Roy S. Clarke. Jr,

This metallic plate with a roughly square outline is covered with a reddish brown weathering crust. Rounding of the plate edges suggests that anterior and posterior surfaces formed during atmospheric ablation. One small area on the edge of the plate had the glassy luster of melted silicate.

 

Polished Section (,1): Roy S. Clarke. Jr,

A 114 mg slice (10 x 3 mm) was removed for section preparation approximately 2 mm in from an edge and perpendicular to the large surface, yielding butts of 193 mg and 867 mg. The sawn surface revealed an area of silicates 0.5 mm thick and extending along the exterior edge for 3.8 mm. After this identification had been made, it became obvious that this silicate area extended along the adjacent exterior surface (3 x 4.5 mm). Several other small areas of silicates were observed partially within metal and located along the exterior edge of the section. The exposed metal has all been heat-altered to a fine α2 structure. Electron microprobe measurements give a uniform metal composition: 6.9 wt% Ni, 0.51 wt% Co, and <0.05 wt% P. Brian Mason looked at the silicates and found olivine (Fa19) and pyroxene (Fs17Wo1). These metal and silicate compositions suggest, that the specimen is a large metal inclusion from an H group chondrite. Metallographic structures suggest that this metal fragment passed through much of the atmosphere as an individual.

 

Data from:
  MB76
  Table 2
  Line 4280:
Origin or pseudonym:Lower Ice Tongue
Mass (g):1.3
Class:H metal
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 14(2) (1991), 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' 59"S, 161° 23' 0"E)
Note: the NHM and MetBase coordinates are 5 km apart

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