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Lewis Cliff 86211
Basic information Name: Lewis Cliff 86211
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86211
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 163.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Iron-an
AMN 13(1)  (1990)  Iron-an (ungrouped)
AMN 17(1)  (1994)  Iron-ung
Meteoritical Bulletin:  MB 76  (1994)  Iron-ung
NHM Catalogue:  5th Edition  (2000)  Iron-ung
MetBase:  v. 7.1  (2006)  Iron-ung
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 129 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Field number: 2317
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW86211; 86498

Location: Lewis Cliff

Weight (g): 163.1; 134.2

Field No.: 2317; 4894

Dimensions (cm): 4.5x4x3; 5x3x3

Meteorite Type: Anomalous Iron

 

Macroscopic Description: Roy S. Clarke, Jr.

A 72.6 gram specimen (LEW86211,3), 4.1 x 2.9 x 2.8 cm, was broken from a larger mass during processing, resulting in approximately two-thirds of its surface area being original exterior and the remainder being interior. The exterior surface is weathered fusion crust, predominately reddish brown in color, containing occasional patches of retained black fusion crust. There are areas of iridescent coloring, and while smooth to the touch, the surface has an unusual roughness and angularity of appearance when viewed with low magnification. There are occasional very small areas (0.1 to 0.5 mm) of bronze colored material. The broken surface areas have a hackly appearance and a predominately yellow color that varies from pale brass yellow to bronze yellow. Under magnification (20x) the yellow material is seen to be present as globules, as fracture surfaces and crystal faces, and as fine filaments. A few small areas appear to be vugs coated with a drusy material. Whether these vug fillings are indigenous or a weathering phenomenon is not clear. A few very small areas of silicates appear to be present as is an occasional chromite.

 

Polished Section Description: Roy S. Clarke. Jr. and René Martinez

This cursory description is based on the examination of a 1 cm2 section, and of a slice of 6 cm2 removed from the piece described above. These reveal a matrix of coarsely crystalline troilite containing globular metal. Metal and troilite are in roughly equal proportions. A typical metal area is 0.3 x 0.6 mm, although particles larger or much smaller are also present. Troilite crystals are in the mm size range and are cracked on the 1/10 mm range. Weathering has penetrated along some of these cracks and along metal/troilite interfaces. A martensitic pattern develops in the metal on etching. Centers of these areas contain 8-9% Ni, while edges contain as much as 20% Ni. There are also occasional silicate-rich areas present. The silicates are fine-grained, the areas are vesicular, and weathering has penetrated into these areas. LEW86498 was broken exposing a fine-grained, vesicular silicate inclusion about 1.5 x 2 cm in cross section.

Data from:
  MB76
  Table 2
  Line 3252:
Origin or pseudonym:South Lewis Cliff
Mass (g):163.1
Class:Iron ung
Fayalite (mol%):2
Ferrosilite (mol%):1-5
Comments:NTL=6±1; 86211 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 18' 42"S, 161° 15' 6"E)
Note: the NHM and MetBase coordinates are 3.7 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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