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Lewis Cliff 86307
Basic information Name: Lewis Cliff 86307
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86307
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.3/3.5
NHM Catalogue:  5th Edition  (2000)  L3.3/3.5
MetBase:  v. 7.1  (2006)  L3.3-3.5
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.3-3.5
Recommended:  L3.3-3.5    [explanation]

This is the only approved meteorite classified as L3.3-3.5.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 3349
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW86307; 86367

Location: Lewis Cliff

Weight (g): 4.9; 10.5

Field No.: 3349; 3327

Dimensions (cm): 3x1x1; 2.5x2x1.5

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Roberta Score, René Martinez

LEW86307 is oblong-shaped and covered with about 80% fusion crust; 86367 has >90% fusion crust. Both specimens are moderately weathered, but inclusions and chondrules are abundant and obvious. No metal is visible.

 

Thin Section (86307,2;86367.3) Description: Brian Mason

LEW86307,2 shows a close-packed aggregate of chondrules and chondrule fragments, up to 1.8 mm across, in a minimum amount of fine-grained dark matrix which contains a small amount of 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 composition: olivine, Fa3-29 (CV FeO is 42) ; pyroxene, Fs2-14. The low content of nickel-iron suggests L group, and the wide range of olivine and pyroxene compositions, type 3; thus this meteorite is classified as an L3 chondrite (estimated L3.5). LEW86367 is very similar to 86307 in all respects and they are probably paired. Both are also similar to LEW86127 and several other LEW86xxx L3 chondrites (Antarctic Meteorite Newsletter v. 11, #1, p. 18).

Data from:
  MB76
  Table 2
  Line 3342:
Origin or pseudonym:Upper Ice Tongue
Mass (g):4.9
Class:L3.3/3.5
Weathering grade:B
Fayalite (mol%):3-29
Ferrosilite (mol%):2-14
Comments:86307 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° 16' 17"S, 161° 25' 53"E)
Note: the NHM and MetBase coordinates are 4.1 km apart

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