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Lewis Cliff 88663
Basic information Name: Lewis Cliff 88663
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88663
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 14.5 g
Antarctic Meteorite Newsletter:  AMN 15(1)  (1992)  Achondrite (?)
AMN 17(1)  (1994)  L7
Meteoritical Bulletin:  MB 76  (1994)  L7
NHM Catalogue:  5th Edition  (2000)  Achondrite-ung
MetBase:  v. 7.1  (2006)  L7
Recommended:  L7    [explanation]

This is 1 of 28 approved meteorites classified as L7.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Field number: 6116
Writeup from AMN 15(1):

Sample No.: LEW88663

Location: Lewis Cliff

Field Number: 6116

Dimensions (cm): 2.6 x 1.8 x 1.7

Weight (g): 14.5

Meteorite Type: Achondrite (?)


Macroscopic Description: Robbie Marlow

Smooth, dull, dark brown fusion crust completely covers LEW88663. Cleaving this meteorite revealed an interior that is brown and black with a crystalline texture. A weathering rind that is about 1-2 mm thick is present. Oxidation is moderate to heavy in areas. No notable interior features were visible.


Thin Section (,2) Description: Brian Mason

The section shows a granular aggregate of subequal amounts of olivine and pyroxene (average grain size 0.3 mm), with about 10% of plagioclase, 5% of troilite, and a trace of chromite. Brown limonitic staining pervades the section. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Wo2Fs20; plagioclase, somewhat variable, An17-23. The olivine and pyroxene compositions match those of an L chondrite, but chondritic structure is absent and the meteorite has no nickel-iron. The meteorite is tenatively classified as an achondrite, but the composition does not seem to match that of any known achondrite.


Data from:
  Table 2
  Line 4503:
Origin or pseudonym:Upper Ice Tongue
Mass (g):14.5
Weathering grade:C
Fayalite (mol%):24
Ferrosilite (mol%):20
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References: Published in Antarctic Meteorite Newsletter 15(1) (1992), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 16' 39"S, 161° 24' 7"E)
Note: the NHM and MetBase coordinates are 3.6 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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