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Lewis Cliff 87007
Basic information Name: Lewis Cliff 87007
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87007
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Aubrite
Meteoritical Bulletin:  MB 76  (1994)  Aubrite
NHM Catalogue:  5th Edition  (2000)  Aubrite
MetBase:  v. 7.1  (2006)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 66 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Field number: 4448
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW87007; 87020; 87294; 87011; 87013; 87017; 87018; 87019; 87021

Location: Lewis Cliff

Field No.: 4448; 4062; 4074; 4060; 4072; 4053; 4073; 4071; 4069

Weight (g): 3.2; 1.9; 3.9;1.0; 0.2; 1.3; 1.2; 0.5; 0.5

Dimensions (cm): 1x1.5x1; 2x1x0.5; Remainder: largest dimension <1 cm

Meteorite Type: Aubrite

 

Macroscopic Description: Roberta Score

The first three specimens above all appear to be paired, as do LEW87011; 87013; 87017; 87018; 87019; and 87021, which have not been thin sectioned because of their small size. They consist of large pyroxene crystals and a small number of rounded, black inclusions in a fine-grained, light-colored matrix.

 

Thin Section (87007,3; 87020,3; 87294,5) Description: Brian Mason

These sections are essentially identical and belong to a single meteorite. They are made up almost entirely of pyroxene clasts, up to 6 mm across, in a groundmass of comminuted pyroxene. Plagioclase is present in small amounts, along with accessory nickel-iron and sulfide. Brown limonitic haloes surround the metal grains. Most of the pyroxene is almost pure MgSiO3 (CaO 0.3-0.9%, FeO less than 0.1%); a little diopside, Wo42En58, is present. Plagioclase is almost pure albite (K2O 0.65%, CaO less than 0.1%). The meteorite is an aubrite.

Data from:
  MB76
  Table 2
  Line 3585:
Origin or pseudonym:South Lewis Cliff
Mass (g):3.2
Class:Aub
Weathering grade:B
Ferrosilite (mol%):0
Comments:87007 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' 40"S, 161° 28' 14"E)
Note: the NHM and MetBase coordinates are 8.1 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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