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Lewis Cliff 86270
Basic information Name: Lewis Cliff 86270
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86270
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  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 16 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: 2343
Writeuphelp
Writeup from AMN 11(1):

Sample No.: LEW86270

Location: Lewis Cliff

Weight (g): 4.2

Field No.: 2343

Dimensions (cm): 2x1.5x1

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Roberta Score

This specimen is highly fractured and has weathered red-brown. Interior is dark with abundant rounded inclusions and is heavily oxidized in some areas.

 

Thin Section (,2) Description: Brian Mason

The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 4 mm across, in a small amount of dark matrix heavily infiltrated with brown limonite. Accessory amounts of nickel-iron and troilite are present, concentrated on the margins of chondrules. Most of the chondrules are of granular or porphyritic olivine and olivine-pyroxene. One barred chondrule consists of olivine (Fa19), pyroxene (Wo12Fs20, with 2.0% Al2O3 and 0.4% TiO2), and plagioclase (An92). Microprobe analyses of the bulk show olivine and pyroxene of variable composition: olivine, Fa0.6-28, mean Fa14 (CV FeO is 52); pyroxene, Fs0.4-19. The low content of nickel-iron suggests L group, and the wide range of olivine and pyroxene compositions type 3, hence the meteorite is tentatively classified as an L3 chondrite (estimated L3.4).

Data from:
  MB76
  Table 2
  Line 3306:
Origin or pseudonym:Lower Ice Tongue
Mass (g):4.2
Class:L3.1
Weathering grade:B/C
Fayalite (mol%):0.6-28
Ferrosilite (mol%):0.4-19
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(1) (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° 15' 16"S, 161° 23' 7"E)
Note: the NHM and MetBase coordinates are 4.7 km apart

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