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Lewis Cliff 85305
Basic information Name: Lewis Cliff 85305
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85305
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 40.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  Eucrite
AMN 17(1)  (1994)  Eucrite-unbr
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 92 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Field number: 2002
Writeuphelp
Writeup from AMN 9(3):

Sample No.: LEW85305

Location: Lewis Cliff

Weight (g): 40.8

Field No.: 2002

Dimensions (cm): 3 x 3 x 1.5

Meteorite Type: Eucrite

 

Macroscopic Description: Roberta Score

LEW85305 has a rectangular shape and is completely covered with shiny fusion crust. Flow marks are apparent in the fusion crust. The interior has a granular texture, plagioclase is evenly disseminated throughout the brownish matrix.

 

Thin Section (,4) Description: Brian Mason

The section shows a granular aggregate of pale brown pyroxene and colorless pyroxene, with accessory opaques; a small amount of an SiO2 polymorph, probably tridymite, is present. The meteorite is unbrecciated, but the pyroxene grains (and to a lesser extent the plagioclase) are considerably granulated. Microprobe analyses show pyroxene compositions ranging almost continuously from Wo6Fs57 to Wo37Fs31, with fairly uniform En content. Plagioclase composition is An84-88. The meteorite is an eucrite; it resembles Ibitira in texture and mineral compositions.

Data from:
  MB76
  Table 2
  Line 2880:
Origin or pseudonym:Upper Ice Tongue
Mass (g):40.8
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):31-57
Comments:NTL=0.036±0.005
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(3) (1986), 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° 17' 14"S, 161° 22' 12"E)
Note: the NHM and MetBase coordinates are 3.2 km apart

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