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| Lewis Cliff 87010 | |||||||||||||||||||||||||||||
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| Basic information | Name: Lewis Cliff 87010 This is an OFFICIAL meteorite name. Abbreviation: LEW 87010 Observed fall: No Year found: 1987 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  2.6 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 136 approved meteorites classified as Eucrite-unbr. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
| Comments: | Field number: 4777 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from AMN 11(2):
Sample No.: LEW87010 Location: Lewis Cliff Weight (g): 2.6 Field No.: 4777 Dimensions (cm): 2 x 1 x 1 Meteorite Type: Unbrecciated Eucrite
Macroscopic Description: Carol Schwarz This small fragment is covered with very shiny black fusion crust. The interior is gray and homogeneous with a small amount of oxidation.
Thin Section (,2) Description: Brian Mason The section shows a subophitic intergrowth of pale brown pigeonite grains (0.3-1.2 mm) and colorless plagioclase laths (up to 1.5 mm long). Pigeonite compositions cluster around Wo5Fs54, but a little augite, Wo43Fs28, is present, and some spots give intermediate compositions. An SiO2 polymorph, probably tridymite, is present as an accessory. The meteorite is an unbrecciated eucrite; mineral compositions and texture resemble those of LEW86001 and 86002, and the possibility of pairing should be considered. Writeup from AMN 33(1):
LEW
87010 original classification in AMN 11, no. 2 as a eucrite. Later
reclassified in AMN 17, no. 1, as a polymict eucrite, but listed in MetBase
7.1 as monomict (brecciated eucrite). Subsequent studies and several thin
sections reveal no brecciation, and compositional studies of [1, 2] all show
very low siderophile element concentrations. Therefore this sample is
reclassified as an unbrecciated eucrite.
[1] Mittlefehldt, D.W., and Lindstrom, M.M. (2003) Geochemistry of eucrites: Genesis of basaltic eucrites, and Hf and Ta as petrogenetic indicators for altered Antarctic eucrites. Geochimica et Cosmochimica Acta, 67, no. 10, 1911-1935. [2] Warren P. H., Kallemeyn, G.W., Huber, H., Ulff-Møller, and Choe, W., (2009) Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73, iss. 19, p. 5918-5943. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 3588: |
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| References: | Published in Antarctic Meteorite Newsletter 11(2) (1988), JSC, Houston Published in Antarctic Meteorite Newsletter 33(1) (2010), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:
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Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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| Revision history: |
This lists important revisions made to data for this record.
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