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Lewis Cliff 88772
Basic information Name: Lewis Cliff 88772
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88772
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 7.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  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: 5641
Writeuphelp
Writeup from AMN 16(1):

Sample No.: LEW88772

Location: Lewis Cliff

Dimensions (cm): 2.4 x 2.0 x 1.1

Weight (g): 7.4

Meteorite Type: Ureilite

 

Macroscopic Description: Cecilia Satterwhite

The fusion crust, which covers 95% of the exterior of the meteorite, is black and contains abundant oxidation haloes. The interior of LEW88772 is browish-black in color with small light gray inclusions in the crystalline matrix. Some areas are weathered to an orangish-brown.

 

Thin Section (,2) Description: Brian Mason

The section shows a coarse-grained aggregate of anhedral olivine and minor pyroxene (maximum grain size 2.4) rimmed by black carbonaceous material. Well-preserved fusion crust is present along one edge. Under cross polars the olivine and pyroxene grains are seen as a mosaic of tiny grains averaging 0.05 mm across, evidently a shock effect. Microprobe analyses show olivine of variable composition, Fa11-18, mean Fa16; pyroxene composition is Wo11Fs11. The meteorite is a ureilite.

 

Data from:
  MB76
  Table 2
  Line 4612:
Origin or pseudonym:Upper Ice Tongue
Mass (g):7.4
Class:Ur
Weathering grade:C
Fayalite (mol%):11-18
Ferrosilite (mol%):11
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 16(1) (1993), 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' 14"S, 161° 21' 22"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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