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Lewis Cliff 88012
Basic information Name: Lewis Cliff 88012
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88012
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 13(2)  (1990)  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 570 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Field number: 6180
Writeuphelp
Writeup from AMN 13(2):

Sample No. LEW 88012

Location: Lewis Cliff

Dimensions (cm): 1.9x1.5x1

Field Number: 6180

Weight (g): 3.8

Meteorite Type: Ureilite

 

Macroscopic Description: Robbie Marlow

LEW88012 has dull brownish-black fusion crust covering 75% of the exterior. Heavy oxidation and abundant mineral grains showing crystal faces are characteristic of this ureilite.

 

Thin Section (,3) Description: Brian Mason

The section shows an aggregate of olivine and pyroxene, as rounded to subhedral grains 0.3-1.5 mm in maximum dimension. The grains are rimmed with black carbonaceous material, which contains trace amounts of nickel-iron and troilite. Microprobe analyses show olivine and pyroxene of uniform composition: olivine, Fa9 (CaO 0.35%, Cr2O3 0.55%); pyroxene, Wo5Fs8. One grain of augite, Wo36Fs5, was analysed. The meteorite is a ureilite, and is relatively unshocked. It is very similar in texture and mineral compositions to LEW 85440, and the possibility of pairing should be considered.

 

Data from:
  MB76
  Table 2
  Line 3869:
Origin or pseudonym:Lower Ice Tongue
Mass (g):3.8
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 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° 14' 52"S, 161° 25' 31"E)
Note: the NHM and MetBase coordinates are 5.5 km apart

Statistics:
     This is 1 of 40744 approved meteorites from Antarctica (plus 4494 unapproved names)
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