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Lewis Cliff 85434
Basic information Name: Lewis Cliff 85434
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85434
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 19.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 13(2)  (1990)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.4
NHM Catalogue:  5th Edition  (2000)  L3.4
MetBase:  v. 7.1  (2006)  L3.4
Recommended:  L3.4    [explanation]

This is 1 of 51 approved meteorites classified as L3.4.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 2431
Writeuphelp
Writeup from AMN 13(2):

Sample No. LEW85434; LEW85437

Location: Lewis Cliff

Dimensions (cm): 2.5x2x1.5; 2x1.5x1

Field Number: 2431; 2427

Weight (g): 19.4; 9.4

Meteorite Type: L3 chondrite

 

Macroscopic Description: Cecilia Satterwhite

Both specimens are covered with weathered fusion crust. The interior of both fragments is-fed-brown. Light colored chondrules are visible in LEW85437.

 

Thin Section (LEW85434,5; LEW85437,3) Description: Brian Mason

These sections are very similar, and the same description applies to both; they are probably paired. They show a close-packed aggregate of chondrules and chondrule fragments, up to 1.8 mm across, in a small amount of dark matrix containing a little troilite and nickel-iron. Chondrule types include granular and porphyritic olivine and olivine-pyroxene, barred olivine, and fine-grained radiating pyroxene. Weathering is extensive, with brown limonitic staining pervading the sections. Olivine and pyroxene show a wide range in composition: olivine, Fa1-23, mean Fa10 (CV FeO is 76); pyroxene, Fs2-11. This range of compositions indicates type 3, and the small amount of nickel-iron suggests L group; the meteorite is therefore classed as an L3 chondrite (estimated L3.4).

 

Data from:
  MB76
  Table 2
  Line 3005:
Origin or pseudonym:Upper Ice Tongue
Mass (g):19.4
Class:L3.4
Weathering grade:C
Fayalite (mol%):1-23
Ferrosilite (mol%):2-11
Comments:85434 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 13(2) (1990), 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° 17' 18"S, 161° 20' 17"E)
Note: the NHM and MetBase coordinates are 2.9 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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