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Lewis Cliff 86258
Basic information Name: Lewis Cliff 86258
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86258
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 24.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  C4
AMN 17(1)  (1994)  CK4
Meteoritical Bulletin:  MB 76  (1994)  CK4
NHM Catalogue:  5th Edition  (2000)  CK4
MetBase:  v. 7.1  (2006)  CK4
Recommended:  CK4    [explanation]

This is 1 of 104 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Field number: 2345
Writeuphelp
Writeup from AMN 11(1):

Sample No.: LEW86258

Location: Lewis Cliff

Weight (g): 24.1

Field No.: 2345

Dimensions (cm): 3.5x3x2

Meteorite Type: C4 Chondrite

 

Macroscopic Description: René Martinez

This specimen is gray and friable with black chondrules protruding from weathered surfaces. About 40% of its exterior surface is covered by polygonally fractured black fusion crust.

 

Thin Section (,3) Description: Brian Mason

The section shows a few chondrules in a matrix consisting largely of fine-grained olivine (grains ranging up to 0.1 mm), with a little pyroxene, plagioclase, and opaques (the opaques are almost entirely magnetite, with a little fine-grained nickel-iron). Most chondrules are about 1 mm in diameter and consist of granular olivine; one large chondrule, 2.5 mm across, consists of radiating plagioclase laths up to 0.8 mm long in a matrix of granular olivine and diopside. Analyses give the following compositions: olivine, Fa29; diopside, Wo42Fs5 with 4.8% Al2O3, 1.9% TiO2; plagioclase, An84-89. The meteorite is classified as a C4 chondrite.

Data from:
  MB76
  Table 2
  Line 3294:
Origin or pseudonym:Lower Ice Tongue
Mass (g):24.1
Class:CK4
Weathering grade:B
Fayalite (mol%):29
Ferrosilite (mol%):5
Comments:NTL=4±2
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 15' 16"S, 161° 21' 58"E)
Note: the NHM and MetBase coordinates are 4.5 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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