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Lewis Cliff 88631
Basic information Name: Lewis Cliff 88631
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 88631
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  Iron-an
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: 6142
Writeuphelp
Writeup from AMN 14(2):

Sample No: LEW88631

Location: Lewis Cliff

Field Number: 6142

Dimensions (cm): 0.8 x 0.9 x 1.1

Weight (g): 3.2

Meteorite Type: An anomalous iron similar to Horse Creek

 

Macroscopic Description: Roy S. Clarke. Jr.

This irregularly shaped and somewhat rounded metallic lump is covered with a reddish brown weathering crust. Black, patchy areas within this crust suggest the possibility that weathered fusion crust is present.

 

Polished Section (,1): Roy S. Clarke. Jr,

A median slice of 370 mg (0.8 x 1.0 cm) was removed for section preparation, leaving butts of 1.11 g and 1.45 g. The sawn surface revealed metal containing a large schreibersite (3.0 x 3.7 mm). Terrestrial corrosion products adhere to edges of the section, and corrosion invades the interior along a series of off-set cracks that penetrate from the edge to the center. Within the corrosion products along exterior edges there are several areas of remnant fusion crust, including one place where both oxidic and melt crust are present. Ablation heating has also melted small areas at the edge of the large schreibersite. A thin rim of α2 structure is present along parts of the exterior metal edge, but most of the metal is kamacite that has not been obviously heat altered. The kamacite contains abundant rhabdites and occasional shock induced distortions. Superimposed upon this basic structure is a dense pattern of fine needles of a silicide mineral, probably perryite. Preliminary electron microprobe analysis of the Si-containing kamacite matrix gave 3.5-4.0 wt% Ni, approximately 0.4 wt% Co, and <0.05 wt% P. The silicide crystals are too thin for easy analysis, but they contain high Ni, with one analysis giving 31 wt% Ni. Silicide crystals also contain small amounts of P. This is an anomalous iron similar to Horse Creek.

 

Data from:
  MB76
  Table 2
  Line 4471:
Origin or pseudonym:Upper Ice Tongue
Mass (g):3.2
Class:Iron ung
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 14(2) (1991), 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' 18"S, 161° 23' 59"E)
Note: the NHM and MetBase coordinates are 3.8 km apart

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