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Elephant Moraine 83245
Basic information Name: Elephant Moraine 83245
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83245
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 59 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  Iron-octahedrite
AMN 13(1)  (1990)  IIAB-an
Meteoritical Bulletin:  MB 76  (1994)  IIAB-an
NHM Catalogue:  5th Edition  (2000)  IIAB-an
MetBase:  v. 7.1  (2006)  IIAB-an
Recommended:  Iron, IIAB-an    [explanation]

This is the only approved meteorite classified as Iron, IIAB-an.
Search for other: IIAB irons, Iron meteorites, and Metal-rich meteorites
Writeuphelp
Writeup from AMN 7(2):

Sample No.: EET83245

Location: Elephant Moraine

Field No.: 1323

Weight (gms): 59.0

Meteorite Type: Coarsest Octahedrite

 

Physical Description: Roy S Clarke, Jr.

This specimen has a smoothly curved top surface that meets a flat bottom surface at one side and an irregular narrow surface that is perpendicular to the bottom surface on the opposite side. The rounded surface is 5.5 cm by 2.5 cm, and the side surface is 1.3 cm thick. The shield shaped specimen is completely covered with a reddish-brown coating of terrestrial iron oxides. No remnant fusion crust was visible. The curved surface appears to have been an exposed surface during weathering; wind ablated, polished, and slightly pitted. The other two surfaces are more deeply corroded.

 

Tentative Classification: Roy S. Clarke, Jr.

A slice from near one end of the specimen cut perpendicular to both the bottom and side surfaces yielded a 1.4 cm2 metallographic section of mainly kamacite. The wind ablated surface was also an ablation surface during atmospheric passage, as it has a heat altered zone extending at least 1 mm into the interior. Fusion crust, however, has been removed by weathering on this surface. The bottom surface appears to consist of either weathered fusion crust or, more likely, weathered melt material that filled a crack during atmospheric heating. Some interior material along this bottom surface is also heat altered. Microrhabdites occur in abundance throughout, with occasional rhabdites and very thin lamellar schreibersites along subgrain boundaries. One grain boundary contains schreibersite and heat altered taenite. The presence of taenite in what appears to be a relatively large mass of kamacite suggests that this specimen is a fragment of a coarsest octahedrite.

Data from:
  MB76
  Table 2
  Line 1509:
Origin or pseudonym:Main icefield
Mass (g):59
Class:IIAB an
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), 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° 17' 4"S, 157° 15' 4"E)
Note: the NHM and MetBase coordinates are 11.5 km apart

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