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Elephant Moraine 87516
Basic information Name: Elephant Moraine 87516
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87516
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 36 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Iron-octahedrite
AMN 13(1)  (1990)  Iron-octahedrite-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
Writeuphelp
Writeup from AMN 11(2):

Sample No.: EET87516

Location: Elephant Moraine

Weight (g): 36.0

Field No.: 4557

Dimensions (cm): 3.4 x 3.2 x 1.4

Meteorite Type: Finest Octahedrite

 

Macroscopic Description: Roy S. Clarke. Jr.

This kite-shaped in outline individual is 3.4 cm from head to tail and 3.2 cm at the shoulders. Its mass is concentrated at the head and shoulders where it is 1.4 cm thick. The narrow tail is curved away from the plane of the head and shoulders. A median slice for metallographic examination was taken perpendicular to this plane and from head to tail, resulting in a section comma-shaped in outline. The smooth curvature of one surface suggests an anterior surface due to oriented flight. Surfaces, however, have been severely weathered and fusion crust has been mainly removed or is too corroded to recognize. The surface coating is reddish-brown, partially iridescent terrestrial oxides.

 

Polished Section Description: Roy S. Clarke, Jr.

The median slice provided approximately 2 cm2 for metallographic examination. Half of the length of the possible anterior surface edge is coated with 0.2 to 0.4 mm of terrestrial oxides, while the rest of this surface has very little adhering oxide. The other surface is mainly covered with oxides, also in the 0.2 to 0.4 mm range. This edge oxide contains a 2 mm long and 0.2 mm thick area of melt crust covered by 0.2 mm of oxide.

 

The structure is that of a very narrow banded finest octahedrite. Kamacite lamellae have band widths from 0.02 to 0.08 mm, the smaller widths being more common. Lamellae lengths are as long as 1 to 2 mm. Kamacite throughout the surface has been converted to α2, probably during atmospheric ablation. Some shock deformation is also present. Remnants of Neumann bands remain as slightly undulating lines of very small (<l ┬Ám) precipitates. Plessite is cellular, and taenite borders appear to have been transformed by heat. Troilite is present and also appears heat-altered. Daubreelite in the few micron size range was tentatively identified. Schreibersite was not observed. This is probably either an anomalous meteorite or a low phosphorus IVA.

Data from:
  MB76
  Table 2
  Line 1690:
Origin or pseudonym:Meteorite City
Mass (g):36
Class:Iron ung
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:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 11'S, 157° 10'E)

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