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Lewis Cliff 87010
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:help 2.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Eucrite
AMN 17(1)  (1994)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  Eu "ub"
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 89 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Field number: 4777
Writeuphelp
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:
Origin or pseudonym:South Lewis Cliff
Mass (g):2.6
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):28-55
Catalogs:
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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:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 20' 25"S, 161° 24' 3"E)
Note: the NHM and MetBase coordinates are 7.3 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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