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Lewis Cliff 86004
Basic information Name: Lewis Cliff 86004
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86004
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
Recommended:  CM2    [explanation]

This is 1 of 541 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Field number: 3486
Writeuphelp
Writeup from AMN 10(2):

Sample No.: LEW86004; LEW86005; LEW86007; LEW86008; LEW86009

Location: Lewis Cliff

Field No.: 3486; 3278; 3214; 3239; 3210

Weight (g): 2.1; 4.7; 1.6; 5.6; 6.5

Dimensions (cm): 1.5 x 1.5 x 1.0; 2 x 1.5 x 1.5; 1.5 x 1.5 x 0.5; 2 x 1.5 x 1; 2 x 1.5 x 1.5

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Roberta Score

Some fusion crust remains on each of these otherwise brownish and black stones. White evaporite deposit speckles the fusion crust-free exterior surfaces of LEW86005 and LEW86007. Some of the deposits have a metallic look to them. The brownish weathering rind extends 1 to 2 mm into the interior of LEW86004, LEW86008 and LEW86009. The interior matrix is jet black and contains abundant rounded and irregular shaped inclusions. The largest inclusion exposed is 2 mm in diameter.

 

Thin Section (LEW86004,3; LEW86005,2; LEW86007,2; LEW86008,3; LEW86009,4) Description: Brian Mason

These specimens are so similar that a single description is adequate. The sections show numerous small colorless grains, mainly olivine, irregular aggregates, and rare chondrules in an opaque to translucent brown matrix. Microprobe analyses of the olivines show a composition range of Fa0-54, with a marked peak at Fa0-1. A few grains of clinoenstatite were analysed, with composition range Fs0-7. The meteorites are C2 chondrites, and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 3047:
Origin or pseudonym:Lower Ice Tongue
Mass (g):2.1
Class:C2
Weathering grade:B
Fayalite (mol%):0-54
Ferrosilite (mol%):0-7
Comments:86004 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), 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° 15' 17"S, 161° 26' 32"E)
Note: the NHM and MetBase coordinates are 5.1 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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