Meteoritical Bulletin: Entry for Lewis Cliff 88772

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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: 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 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Field number: 5641

Writeup

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 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

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