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Lewis Cliff 87005
Basic information Name: Lewis Cliff 87005
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87005
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 17.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Howardite
Meteoritical Bulletin:  MB 76  (1994)  Howardite
NHM Catalogue:  5th Edition  (2000)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 384 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Field number: 4421
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW87005; 87015

Location: Lewis Cliff

Weight (g): 17.7; 1.3

Field No.: 4421; 4052

Dimensions (cm): 2.7x2.6x2.3; 1.3x1x0.7

Meteorite Type: Howardite

 

Macroscopic Description: Carol Schwarz

LEW87005 is covered with about 50% fusion crust. There is one ~3 mm white clast on the "S1" face of the fusion crust. Other surfaces are weathered to a dark gray with a little oxidation visible. The interior matrix is gray with <2 mm white clasts. There are also several large lithic clasts ~.5 cm in diameter present in the exposed area. About 80% of LEW87015 is covered with fusion crust. Exposed areas are gray in color. The interior is light gray with several 1-2 mm white inclusions.

 

Thin Section (LEW87005,2; 87015,2) Description: Brian Mason

LEW87005,2 shows a microbreccia of lithic clasts and plagioclase and pyroxene grains in a comminuted groundmass of these minerals. Plagioclase grains are generally larger than pyroxene, and range up to 2.4 mm across. Lithic clasts range up to 3 mm across, and show a coarse gabbroic texture. Most pyroxene is pigeonite, averaging Wo5Fs50, with compositions ranging to augite, Wo46Fs17; some orthopyroxene is present, averaging Wo2Fs23. Plagioclase composition is An89-94. LEW87015,2 is essentially identical in texture to LEW87005,2 but shows some variations in mineral compositions which are not unexpected in howardites. Most pyroxene is pigeonite, averaging Wo5Fs55, with some compositions ranging to augite, Wo44Fs27, but some orthopyroxene is present, compositions ranging from Wo2Fs30 to Wo1Fs14; plagioclase composition is An80-90. These meteorites are howardites, and are possibly paired.

Data from:
  MB76
  Table 2
  Line 3583:
Origin or pseudonym:South Lewis Cliff
Mass (g):17.7
Class:How
Weathering grade:A
Ferrosilite (mol%):17-66
Comments:87005 pairing group
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° 20' 39"S, 161° 24' 34"E)
Note: the NHM and MetBase coordinates are 7.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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