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Lewis Cliff 85440
Basic information Name: Lewis Cliff 85440
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85440
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 43.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  Ureilite
AMN 17(1)  (1994)  Ureilite-augite-bearing
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-augite-bearing
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 572 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Field number: 2023
Writeuphelp
Writeup from AMN 10(1):

Sample No.: LEW85440

Location: Lewis Cliff

Weight (g): 43.8

Field No.: 2023

Dimensions (cm): 4.5x2.5x2

Meteorite Type: Ureilite

 

Macroscopic Description,: Roberta Score

Thin black fusion crust covers sixty percent of LEW85440. Greenish-gray streaks appear on all fusion crusted surfaces. Abundant minerals all showing crystal faces and areas of heavy oxidation make up the black interior.

 

Thin Section (,4) Description: Brian Mason

The section shows an equigranular aggregate of olivine and pyroxene, as rounded to subhedral grains 0.3-0.6 mm across. The grains are rimmed with black carbonaceous material, which contains trace amounts of nickel-iron (partly weathered to brown limonite) and troilite. Microprobe analyses show olivine and pyroxene of uniform composition: olivine, Fa9 (CaO 0.3%); pyroxene Wo5Fs8. The meteorite is a ureilite; it appears to be relatively unshocked.

Data from:
  MB76
  Table 2
  Line 3011:
Origin or pseudonym:Upper Ice Tongue
Mass (g):43.8
Class:Ur "aug"
Weathering grade:B
Fayalite (mol%):9
Ferrosilite (mol%):8
Comments:85440 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(1) (1987), 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' 55"S, 161° 21' 27"E)
Note: the NHM and MetBase coordinates are 3.1 km apart

Statistics:
     This is 1 of 40753 approved meteorites from Antarctica (plus 4494 unapproved names)
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