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Lewis Cliff 87005 | |||||||||||||||||||||
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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: 17.7 g | ||||||||||||||||||||
Classification history: |
This is 1 of 451 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||
Comments: | Field number: 4421 | ||||||||||||||||||||
Writeup |
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: |
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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: |
Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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Revision history: |
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