Meteoritical Bulletin: Entry for Lewis Cliff 85441

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Lewis Cliff 85441

Basic information

Name: Lewis Cliff 85441
This is an OFFICIAL meteorite name.
Abbreviation: LEW 85441
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 10.9 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 10(1)	(1987)	Howardite
Meteoritical Bulletin:	MB 76	(1994)	Howardite
NHM Catalogue:	5th Edition	(2000)	Howardite
MetBase:	v. 7.1	(2006)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 446 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Field number: 3125

Writeup

help

Writeup from AMN 10(1):

Sample No.: LEW85441

Location: Lewis Cliff

Weight (g): 10.9

Field No.: 3125

Dimensions (cm): 3x2x1.5

Meteorite Type: Howardite

Macroscopic Description: Roberta Score

Fifty percent of the exterior of this achondrite is covered with dull, frothy fusion crust. Areas devoid of fusion crust are brownish-gray and contain numerous clasts. The exposed interior is lighter and grayer in color than the exterior. Abundant clasts, polymict and monomict, are present. Concentrated areas of oxidation do exist.

Thin Section (,3) Description: Brian Mason

The section has a cataclastic texture, with angular fragments of pyroxene and plagioclase up to 2 mm across in a comminuted groundmass of these minerals. The pyroxene is mainly hypersthene, but ranges widely in composition: Wo1-10, Fs25-48, with a mean of Wo4Fs28. Plagioclase is fairly uniform in composition, mean An93. The presence of a significant amount of pyroxene of diogenitic composition indicates that this meteorite can be classified as a howardite.

Data from:
  MB76
  Table 2
  Line 3012:

Origin or pseudonym:	Upper Ice Tongue
Mass (g):	10.9
Class:	How
Weathering grade:	B
Ferrosilite (mol%):	25-48
Comments:	NTL=0.60±0.01; 85441 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

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

Antarctica

Coordinates:
Catalogue of Meteorites:	(84° 17'S, 161° 5'E)
Recommended::	(84° 16' 44"S, 161° 22' 17"E)

Note: the NHM and MetBase coordinates are 3.2 km apart

Statistics:
This is 1 of 43857 approved meteorites from Antarctica (plus 3802 unapproved names)

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