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Lewis Cliff 90500
Basic information Name: Lewis Cliff 90500
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 90500
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 295 g
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  Cl
AMN 15(2)  (1992)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  C2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
Recommended:  CM2    [explanation]

This is 1 of 602 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Field number: 6177
Writeup from AMN 14(2):

Sample No.: LEW90500

Location: Lewis Cliff

Field Number: 6177

Dimensions (cm): 7 x 6.5 x 6

Weight (g): 294.7

Meteorite Type: Carbonaceous C1


Macroscopic Description: Cecilia Satterwhite

This carbonaceous chondrite is covered with dull black fusion crust that is weathered in some areas and frothy in others. Areas devoid of fusion crust are heavily pitted. Black matrix with small lighter colored inclusions make up the interior of this meteorite. Although the sample is coherent, it breaks easily.


Thin Section (.7) Description: Brian Mason

The section is 90% black matrix, with scattered olivine grains up to 0.3 mm across; chondrules are few and small. Olivine grains show a wide range in composition, Fa1-28. The meteorite is tentatively classified as a C1 chondrite.


Data from:
  Table 2
  Line 4626:
Origin or pseudonym:Upper Ice Tongue
Mass (g):294.7
Weathering grade:B
Fayalite (mol%):1-28
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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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     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 17' 29"S, 161° 31' 11"E)
Note: the NHM and MetBase coordinates are 4.9 km apart

     This is 1 of 41899 approved meteorites from Antarctica (plus 3802 unapproved names)
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