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Lewis Cliff 87057
Basic information Name: Lewis Cliff 87057
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87057
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(1)  (1992)  E3
AMN 17(1)  (1994)  E3-an
Meteoritical Bulletin:  MB 76  (1994)  E3-an
NHM Catalogue:  5th Edition  (2000)  E3-an
MetBase:  v. 7.1  (2006)  E3-an
Recommended:  E3-an    [explanation]

This is 1 of 6 approved meteorites classified as E3-an.   [show all]
Search for other: Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Field number: 4051
Writeuphelp
Writeup from AMN 15(1):

Sample No.: LEW87057; 87237; 87285

Location: Lewis Cliff

Field Number: 4051;4794;4791

Dimensions (cm): 1 x 0.5 x.0.4; 1.8 x 1.2 x 0.4; 1 x 0.5 x 0.4

Weight (g): 0.4; 1.9; 0.5

Meteorite Type: E3 chondrite

 

Macroscopic Description: Cecilia Satterwhite and Carol Schwarz

Little fusion crust remains on these three chondrites. Weathering has taken its toll and left their interiors severely oxidized with no features recognizable. All the material from LEW87285 was made into thin sections; potted material is still available from 87057.

 

Thin Section (LEW87057.1: 87237.2: 87285.1) Description: Brian Mason

These three meteorites are identical and can be confidently paired with LEW87223. The sections show a closely packed aggregate of chondrules, up to 1.2 mm across, together with abundant metal grains and minor sulfide. Weathering is extensive, with limonitic staining and areas of brown limonite throughout the sections. The chondrules consist of granular or radiating pyroxene. Most of the pyroxene is close to MgSiO3 in composition, but a few more Fe-rich grains were analyzed. One grain of almost pure forsterite (FeO 0.3%) was found in 87057. The metal has a variable Si content, up to 0.6%. The meteorites are classified as E3 chondrites.

 

Data from:
  MB76
  Table 2
  Line 3634:
Origin or pseudonym:South Lewis Cliff
Mass (g):0.4
Class:E3 an
Weathering grade:C
Fayalite (mol%):0.3
Ferrosilite (mol%):0.1-18
Comments:87057 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(1) (1992), 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' 48"S, 161° 19' 32"E)
Note: the NHM and MetBase coordinates are 7.6 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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