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Elephant Moraine 83390
Basic information Name: Elephant Moraine 83390
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83390
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 15.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  Iron-octahedrite
AMN 13(1)  (1990)  IIE-an
Meteoritical Bulletin:  MB 76  (1994)  IIE-an
NHM Catalogue:  5th Edition  (2000)  IIE-an
MetBase:  v. 7.1  (2006)  IIE-an
Recommended:  Iron, IIE-an    [explanation]

This is 1 of 7 approved meteorites classified as Iron, IIE-an.   [show all]
Search for other: IIE irons, Iron meteorites, and Metal-rich meteorites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: EET83390

Location: Elephant Moraine

Weight (g): 15.2

Field No.: 2964

Dimensions (cm): 2 x 1.8 x 1

Meteorite Type: Atmospherically heat-affected coarse or medium Octahedrite

Macroscopic Description: Roy S. Clarke, Jr.

the specimen is irregular in shape and deeply weathered. The surface is covered with reddish brown secondary oxides, and it contains several small depressions that may have resulted from atmospheric melting.

 

Polished Section Description: Roy S. Clarke, Jr.

A median section provided an area of 1 sq. cm for examination. The structure revealed is that of a heat-affected medium or coarse octahedrite. The few structures available for band width measurements indicate a 1 to 1.5 mm range. Throughout the section kamacite has been transformed to a by atmospheric heating. Most of the rim of the section is coated wit layered secondary oxides 0.1 to 1 mm thick.

 

Taenite and comb plessite areas appear to have been somewhat heat-affected. Microrhabdites are present, and several remnant Neumann bands are suggested by linear arrays of microrhabdites. Major grain boundaries are populated over much of their lengths by either grain boundary schreibersite or secondary iron oxides that have invaded into the interior. Some schreibersite is associated with taenite-plessite areas.

 

This specimen appears to be a small individual that was severely heated upon passage through the atmosphere. It is an octahedrite and may prove on further study to be a Group III meteorite.

Data from:
  MB76
  Table 2
  Line 1648:
Origin or pseudonym:Main icefield
Mass (g):15.2
Class:IIE an
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(1) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 19' 45"S, 157° 11' 45"E)
Note: the NHM and MetBase coordinates are 16.3 km apart

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