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Lewis Cliff 86408
Basic information Name: Lewis Cliff 86408
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86408
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.5
NHM Catalogue:  5th Edition  (2000)  L3.5
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 3480
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW86408; 86417; 86436; 86505

Location: Lewis Cliff

Field No.: 3480; 3492; 3431; 4895

Weight (g): 1.4; 1.6; 3.9; 43.9

Dimensions (cm): 1x1x0.5; 1.2x1x0.8; 1.5x1x0.5; 4x3.5x1.5

Meteorite Type: L3 Chondrite

 

Macroscopic, Description: René Martinez

All of these , with the exception of LEW86505, show light and dark chondrules in a dark coherent matrix. 86505 is comparatively fresh with a light gray matrix and large, fresh inclusions up to 4 mm.

 

Thin Section (86408,2; 86417,2; 86436,2; 86505,2) Description: Brian Mason

These meteorites are very similar in all respects and are possibly paired with LEW86127 and several other LEW86xxx L3 chondrites (Antarctic Meteorite Newsletter, v. 11, #1, p. 18). The sections show a close-packed aggregate of chondrules and chondrule fragments, up to 2.1 mm across, in a minimum amount of fine-grained dark matrix which contains a little nickel-iron and troilite. Chondrule types include granular and porphyritic olivine and olivine-pyroxene, and radiating and cryptocrystalline pyroxene. Weathering is extensive, with brown limonitic staining throughout. Microprobe analyses show olivine and pyroxene with a wide range of compositions: olivine, Fa1 30; pyroxene, Fs1-24. The low content of nickel-iron suggests L group, and the wide range of olivine and pyroxene compositions type 3, hence these meteorites are tentatively classified as L3 chondrites (estimated L3.5).

Data from:
  MB76
  Table 2
  Line 3441:
Origin or pseudonym:Lower Ice Tongue
Mass (g):1.4
Class:L3.5
Weathering grade:C
Fayalite (mol%):11-25
Ferrosilite (mol%):2-23
Comments:86127 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (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' 19"S, 161° 25' 54"E)
Note: the NHM and MetBase coordinates are 5 km apart

Statistics:
     This is 1 of 40744 approved meteorites from Antarctica (plus 4494 unapproved names)
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