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Lewis Cliff 87004
Basic information Name: Lewis Cliff 87004
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87004
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 208 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Eucrite
AMN 17(1)  (1994)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Field number: 4425
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW87004

Location: Lewis Cliff

Weight (g): 208.4

Field No.: 4425

Dimensions (cm): 7x 6 x 4.5

Meteorite Type: Polymict Eucrite

 

Macroscopic Description: Carol Schwarz

This eucrite is ~90% covered by black shiny fusion crust. Flow lines occur on most surfaces. There are a few pitted areas where fusion crust is absent. The interior is gray with mm-sized white clasts, 1-2 mm dark gray inclusions, and minor oxidation.

 

Thin Section (,2) Description: Brian Mason

The section shows a microbreccia of pyroxene and plagioclase grains, up to 0.6 mm across, in a comminuted groundmass of these minerals; a few small lithic clasts are present. Microprobe analyses show pyroxene with a wide range of compositions: Wo2-27, Fs31-56, En31-61; plagioclase composition is An83-89. The meteorite is a polymict eucrite.

Data from:
  MB76
  Table 2
  Line 3582:
Origin or pseudonym:South Lewis Cliff
Mass (g):208.4
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):31-56
Comments:NTL=4.3±0.4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 21' 37"S, 161° 19' 0"E)
Note: the NHM and MetBase coordinates are 9 km apart

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