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Lewis Cliff 85306
Basic information Name: Lewis Cliff 85306
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 85306
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.5 g
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  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
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: 2001
Revised 3 Jun 2019: reclassified in AMN 41(1)
Writeup from AMN 9(3):

Sample No.: LEW85306, 85309, 85311, 85312

Location: Lewis Cliff

Field Nos.: 2001; 2047; 3103; 3108

Weight (g): 6.5; 54.1; 199.5; 31.7

Dimensions (cm): 2.5x2.5x1.5; 6x3.5x3; 6x5x5 and 5x2x3; 4.5x3x3

Meteorite Type: C2 Chondrite


Macroscopic Description: René Martinez

Frothy black fusion crust appears as patches on these stones. The interiors of these fragments have abundant light-colored clasts/chondrules that are set in a black fine-grained matrix. Thin evaporite deposit is present on 85309. Some brownish-red oxidation was noted.


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.


LEW85309, 85311, and 85312 are very similar to LEW85306 in texture and mineral compositions, and the possibility of pairing should be considered.

Writeup from AMN 41(1):
LEW 85306: reclassification

Listed by Choe et al. (2010) as CM2-anomalous
  • 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:
  Table 2
  Line 2881:
Origin or pseudonym:Upper Ice Tongue
Mass (g):6.5
Weathering grade:A
Fayalite (mol%):0.2-33
Ferrosilite (mol%):0.7-5.5
Comments:85306 pairing group
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References: Published in Antarctic Meteorite Newsletter 41(1) (2018), JSC, Houston
Published in Antarctic Meteorite Newsletter 9(3) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 16' 56"S, 161° 22' 6"E)
Note: the NHM and MetBase coordinates are 3.2 km apart

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