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Lewis Cliff 86018
Basic information Name: Lewis Cliff 86018
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86018
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 502 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.1
NHM Catalogue:  5th Edition  (2000)  L3.1
MetBase:  v. 7.1  (2006)  L3.1
Recommended:  L3.1    [explanation]

This is 1 of 15 approved meteorites classified as L3.1.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 4004
Writeuphelp
Writeup from AMN 10(2):

Sample No.: LEW86018

Location: Lewis Cliff

Weight (g): 502.0

Field No.: 4004

Dimensions (cm): 10 x 6 x 6

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Roberta Score

Dull black fusion crust covers 60% of this unequilibrated chondrite. Areas devoid of fusion crust are reddish-brown. The clastic nature of the stone is apparent even though the interior is fairly weathered. Matrix is brown in color and contains numerous inclusions. The largest inclusion is 5 mm long. A minute amount of evaporite deposit exists immediately under the fusion crust.

 

Thin Section (,6) Description: Brian Mason

The section shows a close-packed mass of chondrules, chondrule fragments, and irregular granular aggregates in a small amount of dark fine-grained matrix. Chondrules range up to 3.2 mm across, and show a diversity of type, the commonest being granular and porphyritic olivine and olivine-pyroxene. Brown limonitic staining pervades the section. Microprobe analyses show olivine and pyroxene with variable compositions: olivine, Fa0.7-32 , with a mean of Fa15 (CV FeO is 44) ; pyroxene, Fs2-9. The meteorite is an L3 chondrite (estimated L3.5).

Data from:
  MB76
  Table 2
  Line 3061:
Origin or pseudonym:Upper Ice Tongue
Mass (g):502
Class:L3.1
Weathering grade:Be
Fayalite (mol%):0.7-32
Ferrosilite (mol%):2-9
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° 16' 36"S, 161° 38' 57"E)
Note: the NHM and MetBase coordinates are 6.3 km apart

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