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Lewis Cliff 87006
Basic information Name: Lewis Cliff 87006
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87006
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 270 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Mesosiderite
Meteoritical Bulletin:  MB 76  (1994)  Mesosiderite
NHM Catalogue:  5th Edition  (2000)  Mesosiderite
MetBase:  v. 7.1  (2006)  Mesosiderite-A
Recommended:  Mesosiderite-A    [explanation]

This is 1 of 3 approved meteorites classified as Mesosiderite-A.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Field number: 4714
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW87006

Location: Lewis Cliff

Weight (g): 269.5

Field No.: 4714

Dimensions (cm): 5.5 x 6 x 3.5

Meteorite Type: Mesosiderite

 

Macroscopic Description: Roberta Score

Dull, black fusion crust remains as small patches over most of the exterior. Some regmaglypts are present. Several large pyroxene grains are obvious on the exterior of this specimen. The matrix is fine-grained and beige in color. Pyroxene inclusions are numerous, as are sulfides/metal.

 

Thin Section (,2) Description: Brian Mason

The section shows about 30% of large grains (up to 2 mm) of nickel-iron in a granular matrix of pyroxene with a little plagioclase. Pyroxene grains are up to 1.2 mm across, but many appear to have been deformed to a mosaic of tiny granules. Moderate weathering is indicated by rusty staining around metal grains. Pyroxene composition is fairly uniform, Wo3Fs36, with minor variation in CaO content (1.2-3.1%); one grain of augite, Wo39Fs17, with 1.6% Al2O3, was analyzed. Plagioclase composition is An89-94. The meteorite is a mesosiderite.

Data from:
  MB76
  Table 2
  Line 3584:
Origin or pseudonym:South Lewis Cliff
Mass (g):269.5
Class:Meso
Weathering grade:B
Ferrosilite (mol%):17-36
Comments:NTL=10±1
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° 23' 55"S, 161° 16' 44"E)
Note: the NHM and recommended coordinates are 13.1 km apart

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