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Lewis Cliff 86021
Basic information Name: Lewis Cliff 86021
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86021
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 326 g
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.5/3.9
NHM Catalogue:  5th Edition  (2000)  L3.5/3.9
MetBase:  v. 7.1  (2006)  L3.5-3.9
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.5-3.9
Recommended:  L3.5-3.9    [explanation]

This is the only approved meteorite classified as L3.5-3.9.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 2332
Writeup from AMN 11(1):

Sample No.: LEW86021

Location: Lewis Cliff

Weight (g): 325.8

Field No.: 2332

Dimensions (cm): 6x6.5x4.5

Meteorite Type: L3 Chondrite


Macroscopic Description: Roberta Score

LEW86021 is a rounded specimen that is mostly covered with iridescent fusion crust. Evaporite deposit is present on some exterior surfaces. The interior of LEW86021 is heavily weathered. Large areas of orange oxidation are present in the otherwise red-brown interior. Some evaporite deposit developed on the interior surfaces after the stone dried in a nitrogen cabinet for several hours.


Thin Section (,5) Description: Brian Mason

The section shows a close-packed mass of chondrules (up to 2.7 mm across), chondrule fragments, and irregular crystalline aggregates, together with minor amounts of interstitial nickel-iron and troilite. A variety of chondrule types is present, including granular and porphyritic olivine and olivine-pyroxene, barred olivine, and radiating pyroxene. Weathering is extensive, with limonitic staining and areas of brown limonite throughout the section. Microprobe analyses give the following compositions: olivine, Fa18-28, mean Fa21 (CV FeO is 10); pyroxene, Fs4-17. The meteorite is an L3 chondrite (estimated L3.9).

Data from:
  Table 2
  Line 3064:
Origin or pseudonym:Lower Ice Tongue
Mass (g):325.8
Weathering grade:Ce
Fayalite (mol%):18-28
Ferrosilite (mol%):4-17
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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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     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 15' 14"S, 161° 21' 4"E)
Note: the NHM and MetBase coordinates are 4.4 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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