Meteoritical Bulletin: Entry for Lewis Cliff 88012

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

Comments:

Field number: 6180

Writeup

help

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:

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 13(2) (1990), 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° 14' 52"S, 161° 25' 31"E)

Note: the NHM and MetBase coordinates are 5.5 km apart

Statistics:
This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)

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