Meteoritical Bulletin: Entry for Lewis Cliff 85307

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Lewis Cliff 85307

Basic information

Name: Lewis Cliff 85307
This is an OFFICIAL meteorite name.
Abbreviation: LEW 85307
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 1.7 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 10(1)	(1987)	C2
Meteoritical Bulletin:	MB 76	(1994)	C2
NHM Catalogue:	5th Edition	(2000)	C2
MetBase:	v. 7.1	(2006)	CM2
Antarctic Meteorite Newsletter:	AMN 31(1)	(2008)	CM2
	AMN 41(1)	(2018)	CM2-an
Recommended:			CM2-an [explanation]

This is 1 of 10 approved meteorites classified as CM2-an. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Field number: 3178
Revised 3 Jun 2019: reclassified in AMN 41(1)

Writeup

Writeup from AMN 10(1):

Sample No.: LEW85307

Location: Lewis Cliff

Weight (g): 1.7

Field No.: 3178

Dimensions (cm): 2x1x1

Meteorite Type: C2 Chondrite

Macroscopic Description: René Martinez

LEW85307 is rounded and is totally covered with smooth fusion crust. Numerous <1 mm-sized white inclusions are present in the black matrix.

Thin Section (LEW85306,3) Description: Brian Mason

The section shows numerous mineral grains and aggregates and a few small (maximum diameter 0.6 mm) chondrules in a brown to black matrix. Most of the mineral grains are olivine, usually near Mg2SiO4 in composition, but some are more iron-rich. Pyroxene is less abundant, and is near MgSiO3 in composition. The meteorite is a C2 chondrite. LEW85307 as well as 85309, 85311, and 85312 are very similar to LEW85306 and probably paired with it.

Writeup from AMN 41(1):

LEW 85307: reclassification

Listed by Choe et al. (2010) as CM2-anomalous

Bibliography:

Choe W. H., Huber H., Rubin A.E., Kallemeyn G. W., and Wasson J. T. (2010) Compositions and taxonomy of 15 unusual carbonaceous chondrites. Meteorit. Planet. Sci. 45, 531-554 (link)

Data from:
  MB76
  Table 2
  Line 2882:

Origin or pseudonym:	Upper Ice Tongue
Mass (g):	1.7
Class:	C2
Weathering grade:	A
Fayalite (mol%):	0.6-46
Comments:	85306 pairing group

Catalogs:

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

Published in Antarctic Meteorite Newsletter 10(1) (1987), JSC, Houston
Published in Antarctic Meteorite Newsletter 41(1) (2018), 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° 16' 44"S, 161° 24' 23"E)

Note: the NHM and MetBase coordinates are 3.6 km apart

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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