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Lewis Cliff 85328
Basic information Name: Lewis Cliff 85328
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85328
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 106.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
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: 2035
Writeuphelp
Writeup from AMN 10(1):

Sample No.: LEW85328

Location: Lewis Cliff

Weight (g): 106.8

Field No.: 2035

Dimensions (cm): 5x4x2

Meteorite Type: Ureilite

 

Macroscopic Description: Cecilia Satterwhite

LEW85328 is covered by black fusion crust which has well defined ablation marks and is frothy in some areas. An ablation flange is present. Two mm-sized brown crystals make up the interior of this achondrite.

 

Thin Section (,5) Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains (0.3-2.4 mm across) of olivine and pyroxene, in the approximate proportions of 2:1. Individual grains are rimmed by carbonaceous material. Trace amounts of finely-divided nickel-iron and troilite are present, mainly along grain boundaries. Microprobe analyses show olivine of uniform composition (Fa20) with notably high CaO content (0.3%); the pyroxene is pigeonite with composition Wo9Fs17. The meteorite is a ureilite; it is notably unshocked compared to most ureilites.

Data from:
  MB76
  Table 2
  Line 2901:
Origin or pseudonym:Upper Ice Tongue
Mass (g):106.8
Class:Ur
Weathering grade:B/C
Fayalite (mol%):20
Ferrosilite (mol%):17
Comments:NTL=31±6
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° 17' 11"S, 161° 37' 23"E)
Note: the NHM and MetBase coordinates are 6 km apart

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