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Elephant Moraine 87500
Basic information Name: Elephant Moraine 87500
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87500
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 8.13 kg
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Mesosiderite
Meteoritical Bulletin:  MB 76  (1994)  Mesosiderite
NHM Catalogue:  5th Edition  (2000)  Mesosiderite
MetBase:  v. 7.1  (2006)  Mesosiderite-B
Recommended:  Mesosiderite-B    [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-B.   [show all]
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites
Writeup from AMN 11(2):

Sample No.: EET87500; 87501

Location: Elephant Moraine

Weight (g): 8132.0; 4403.0

Field No.: 4688; 4367

Dimensions (cm): 25x16x12.5; 17.5x11x11

Meteorite Type: Mesosiderite


Macroscopic Description: Roberta Score

Deep regmaglypts are present on the weathered surface of EET87500, a mesosiderite. Only a few small patches of fusion crust remain on the surface. Abundant pyroxene inclusions, up to 2.5 cm in their longest dimension, are visible on the exterior. This meteorite is moderately weathered. The interior consists of approximately two-thirds silicates, coarse-grained pyroxene and plagioclase, and one-third metal. The exterior of EET87501 has regmaglypts and a thin fusion crust with flow marks. The interior is identical to EET87500 except that it appears to be more weathered.


Thin Section (87500,2; 87501,2) Description: Brian Mason

These sections are so similar in all respects that the specimens are almost certainly paired. They show a granular aggregate of approximately 50% pyroxene, 30% nickel-iron, and 20% plagioclase, with accessory merrillite and an SiO2 polymorph, probably tridymite. The grain size is relatively coarse, with individual pyroxenes and plagioclases up to 2 mm across; many pyroxenes are partly or completely converted into a mosaic of small granules. Weathering is minimal. Pyroxene compositions vary somewhat around a mean of Wo6Fs30: Wo3-14, Fs30-31, En54-62. Plagioclase composition is An91-96. The meteorite is a mesosiderite.

Data from:
  Table 2
  Line 1674:
Origin or pseudonym:Northern Ice Patch
Mass (g):8132
Weathering grade:B
Ferrosilite (mol%):30-31
Comments:NTL=0.18±0.05; 87500 pairing group
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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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     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 3' 1"S, 156° 4' 12"E)
Note: the NHM and MetBase coordinates are 32.9 km apart

     This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names)
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