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Lewis Cliff 87250
Basic information Name: Lewis Cliff 87250
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87250
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  C4
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 105 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: 4784
Writeuphelp
Writeup from AMN 12(3):

Sample No.: LEW87250

Location: Lewis Cliff

Dimensions (cm): 1 x1.3x0.5

Field Number: 4784

Weight (g): 1.7

Meteorite Type: C4 chondrite

 

Macroscopic Description: René Martinez

LEW87250 is a complete specimen with fusion crust covering 100% of the stone. This carbonaceous chondrite is light gray in color, fine-grained, and friable.

 

Thin Section (,3) Description: Brian Mason

The section shows an aggregate of small (0.01-0.02 mm) olivine grains and a little opaque material (magnetite and pentlandite), with a few chondrules up to 0.6 mm across. Thick fusion crust mantles part of the section. Olivine composition is essentially uniform, Fa29; a little orthopyroxene, Fs25, was analysed. Two grains of plagioclase, An18, and An31, were analysed. The meteorite is a C4 chondrite, and closely resembles LEW87214.

Data from:
  MB76
  Table 2
  Line 3814:
Origin or pseudonym:South Lewis Cliff
Mass (g):1.7
Class:CK4
Weathering grade:A/B
Fayalite (mol%):29
Ferrosilite (mol%):25
Comments:87214 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 12(3) (1989), 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° 20' 25"S, 161° 24' 3"E)
Note: the NHM and MetBase coordinates are 7.3 km apart

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