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Lewis Cliff 86022
Basic information Name: Lewis Cliff 86022
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86022
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 352 g
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.2/3.5
NHM Catalogue:  5th Edition  (2000)  L3.2/3.5
MetBase:  v. 7.1  (2006)  L3.2-3.5
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.2-3.5
Recommended:  L3.2-3.5    [explanation]

This is the only approved meteorite classified as L3.2-3.5.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 4971
Writeup from AMN 11(1):

Sample No.: LEW86022

Location: Lewis Cliff

Weight (g): 351.7

Field No.: 4971

Dimensions (cm): 8.5x5x7

Meteorite Type: L3 Chondrite


Macroscopic Description: Roberta Score

LEW86022 is a weathered chondrite fragment that is highly polished and iridescent, retains 40% of its original fusion crust, and has greenish streaks of oxidation on the exterior surfaces. Abundant inclusions are still obvious in the extensively weathered interior.- A minute amount of "salts" is present in the interior.


Thin Section (,4) Description: Brian Mason

The section shows a close-packed mass of chondrules (up to 2.9 mm across), chondrule fragments, and irregular granular aggregates, set in a small amount of opaque matrix which includes minor amounts of nickel-iron and troilite. Most chondrules consist of granular or porphyritic olivine, some with polysynthetically twinned clinopyroxene. Microprobe analyses give the following compositions: olivine, Fa6-34, mean Fa18 (CV FeO is 46); pyroxene, Fs1-31. The meteorite is classified as an L3 chondrite (estimated L3.5); it is similar to LEW85396 and 85401, and the possibility of pairing should be considered.

Data from:
  Table 2
  Line 3065:
Origin or pseudonym:Lower Ice Tongue
Mass (g):351.7
Weathering grade:B/Ce
Fayalite (mol%):6-34
Ferrosilite (mol%):1-31
Comments:85396 pairing group
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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° 13' 54"S, 161° 31' 47"E)
Note: the NHM and MetBase coordinates are 7.6 km apart

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