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Elephant Moraine 84300
Basic information Name: Elephant Moraine 84300
     This is an OFFICIAL meteorite name.
Abbreviation: EET 84300
Observed fall: No
Year found: 1984 or 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 72.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  Iron-octahedrite
AMN 13(1)  (1990)  IAB w/silicate inclusions
Meteoritical Bulletin:  MB 76  (1994)  IAB
NHM Catalogue:  5th Edition  (2000)  IAB
MetBase:  v. 7.1  (2006)  IAB-ung
Recommended:  Iron, IAB-ung    [explanation]

This is 1 of 56 approved meteorites classified as Iron, IAB-ung.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: EET84300

Location: Elephant Moraine

Weight (g): 72.2

Field No.: 2489

Dimensions (cm): 3.5 x 3 x 2

Meteorite Type: Silicate-rich finest Octahedrite

 

Macroscopic Description: Roy S. Clarke, Jr.

This specimen is irregularly shaped, pitted, weathered, and covered with a reddish brown coating of secondary oxides.

 

Polished Section Description: Roy S. Clarke, Jr.

An off-center section through the specimen provided an area of 4 sq. cm for examination. About one-third of this surface area contains silicate clusters and individual silicate crystals dispersed in metal. These Orsilicate [sic] association comprise about 5% of the total area. The metal is polycrystalline, containing three cm-size areas of finest octahedrite structure with band widths around 0.1 mm. These three large areas are separated by two comparatively wide bands of kamacite containing median grain boundary schreibersite. The silicate-rich area is more complex and contains smaller areas of finest octahedrite structure. The slice is rimmed with essentially continuous secondary oxides about 0.2 mm thick. A few small metal areas near the rim contain «2 structure, its deepest penetration being less than 0.5 mm.

 

Dominant features within the metal areas are a Widmanstätten pattern of taenite, cellular plessite, and kamacite lamellae. Schreibersite is found at junctions of kamacite lamellae, at centers of kamacite lamellae, and within plessite areas. A number of graphite inclusions are present, ranging in size from a few hundredths of a mm to 0.5 mm. Tiny inclusions of daubreelite were tentatively identified.

 

Silicates occur as clusters and as individual grains within metal. They range from transparent to translucent, and from water-clear to slightly colored. Some of the coloring is probably due to weathering. A 0.5 mm transparent and slightly green crystal proved on electron microprobe examination to be diopside. Other silicates identified were plagioclase (An12), olivine (Fa0.8), and pyroxene (Fs6). The cluster silicates are coarsely crystalline, and associated with polycrystalline troilite, small amounts of metal, and schreibersite and/or carbide.

 

This specimen is a silicate- and graphite-rich polycrystalline finest octahedrite. It is distinct from EET83333.

Data from:
  MB76
  Table 2
  Line 1662:
Origin or pseudonym:Main icefield
Mass (g):72.2
Class:IAB
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' 12"S, 157° 15' 27"E)
Note: the NHM and MetBase coordinates are 15.4 km apart

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