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Elephant Moraine 87504
Basic information Name: Elephant Moraine 87504
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87504
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 10.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Iron w/silicate inclusions
AMN 13(1)  (1990)  IAB-an w/silicate inclusions
Meteoritical Bulletin:  MB 76  (1994)  IAB-an
NHM Catalogue:  5th Edition  (2000)  IAB-an
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 11(2):

Sample No.: EET87504; 87505; 87506

Location: Elephant Moraine

Weight (g): 10.7; 14.5; 15.2

Field No.: 4557; 4353; 4369

Dimensions (cm): 2x1.5x1; 3x2x1; 2.5x2x1.5

Meteorite Type: Iron with silicate inclusions

 

Macroscopic Description: Roberta Score

All three specimens are weathered to a deep red-brown color with no fusion crust remaining. Oxidation haloes are obvious on the exterior surfaces as is gold-colored metal. Fractures penetrate the interior of the three specimens. Chipping revealed somewhat less weathered metal, lots of oxidation, and some colorless crystals. A minute amount of salt deposit is present. All three fragments are obviously paired.

 

Thin Section (87504,4; 87505,3; 87506,4) Description: Brian Mason and Roy S. Clarke, Jr.

These specimens are so similar in all respects that they must be pieces of a single meteorite. The sections are made up largely of nickel-iron, which includes numerous anhedral grains and aggregates of silicate minerals (grain size 0.3-3.1 mm), dominantly pyroxene, with minor olivine and a little plagioclase. One large grain of apatite was noted in 87504,4. Weathering is extensive, the sections being seamed with brown limonite. Microprobe analyses give the following compositions: olivine, Fa3; pyroxene, Wo2Fs6 (CaO content varies slightly, 0.7-1.2%); plagioclase somewhat variable, average An3 (CaO 0.1-1.6%, K2O 0.2-2.2%). Metal areas of 87504,4 consist of kamacite in contact with large amounts of plessite. The association within the plessite areas is: clear taenite borders (probably tetrataenite), cloudy taenite, clear taenite, and comparatively large areas of martensite. Areas of troilite in the mm size range are present, several containing well developed (0.1 mm) crystals of radiating graphite. The meteorites are irons with silicate inclusions.

Data from:
  MB76
  Table 2
  Line 1678:
Origin or pseudonym:Meteorite City
Mass (g):10.7
Class:IAB an
Weathering grade:B
Fayalite (mol%):3
Ferrosilite (mol%):6
Comments:87504 pairing group
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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