Meteoritical Bulletin: Entry for Lewis Cliff 87051

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Lewis Cliff 87051

Basic information

Name: Lewis Cliff 87051
This is an OFFICIAL meteorite name.
Abbreviation: LEW 87051
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 0.6 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 13(1)	(1990)	Angrite
Meteoritical Bulletin:	MB 76	(1994)	Angrite
NHM Catalogue:	5th Edition	(2000)	Angrite
MetBase:	v. 7.1	(2006)	Angrite
Recommended:			Angrite [explanation]

This is 1 of 51 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites

Comments:

Field number: 4058

Writeup

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Writeup from AMN 12(1):

Sample No.: LEW87051

Location: Lewis Cliff

Weight(g): 0.6

Field No.: 4058

Dimensions (cm): 1 x 0.7 x 0.5

Meteorite Type: Angrite

Macroscopic Description; Rene, Martinet

This tiny achondrite is completely covered with black fusion crust. The interior is very fresh looking, fine-grained, and crystalline.

Thin Section (,3) Description: Brian Mason

The section consists of subequal amounts of olivine, pyroxene, and plagioclase, with a little opaque material, probably titanomagnetite. The texture is dominated by a subparallel arrangement of plagioclase laths, 0.02 mm wide and up to 0.3 mm long. The pyroxene is weakly pleochroic with a purplish tint. Microprobe analyses give the following compositions: plagioclase, An100 (K₂O, Na₂O both less than 0.1%); olivine, somewhat variable, averaging Fa₁₉ with 0.7% CaO (one spot gave a kirschsteinite analysis, Ca₃₈Fe₈₀Mg₂); the pyroxene is a titanian fassaite, averaging Wo₄₇Fs₃₃ with up to 8.5% Al₂O₃ and 4.6% TiO₂. The meteorite is an angrite, but is texturally distinct from the other angrites, Angra dos Reis and LEW86010.

Data from:
  MB76
  Table 2
  Line 3628:

Origin or pseudonym:	South Lewis Cliff
Mass (g):	0.6
Class:	Angr
Weathering grade:	A
Fayalite (mol%):	19
Ferrosilite (mol%):	33

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
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References:

Published in Antarctic Meteorite Newsletter 12(1) (1989), 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° 20' 53"S, 161° 28' 57"E)

Note: the NHM and MetBase coordinates are 8.5 km apart

Statistics:
This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names)

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