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| Elephant Moraine 87500 | |||||||||||||||||||||
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| 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:  8.13 kg | ||||||||||||||||||||
| Classification history: |
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 |
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: MB76 Table 2 Line 1674: |
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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:
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Statistics: This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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