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Elephant Moraine 87720
Basic information Name: Elephant Moraine 87720
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87720
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 91.3 g
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  Ureilite
AMN 17(1)  (1994)  Ureilite-pmict?
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-pmict?
NHM Catalogue:  5th Edition  (2000)  Ureilite-pmict
MetBase:  v. 7.1  (2006)  Ureilite-pmict
Recommended:  Ureilite-pmict    [explanation]

This is 1 of 31 approved meteorites classified as Ureilite-pmict.   [show all]
Search for other: Achondrites, Ureilites
Writeup from AMN 12(3):

Sample No.: EET87720

Location: Elephant Moraine

Dimensions (cm): 5x3x3

Field Number: 4579

Weight (g): 91.3

Meteorite Type: Ureilite


Macroscopic Description: Carol Schwarz

The exterior surface of EET87720 is weathered smooth and has a thin, patchy fusion crust covering 70 percent. The interior matrix is dark and heavily oxidized. Abundant mineral grains, some as large as several millimeters in length, are present but are very rusty. Evaporite minerals were noted.


Thin Section (,3) Description: Brian Mason

The section shows a cataclastic aggregate of anhedral olivine grains, up to 3.6 mm across, with minor pyroxene. Brown limonitic staining pervades the section. Under crossed polars the olivine grains are seen as a mosaic of tiny crystals, evidently a shock effect. Microprobe analyses show olivine of variable composition, Fa13-21, with a mean of Fa17; pyroxene consists in part of pigeonite, Wo8Fs9, and in part of augite, Wo35Fs13; one grain of plagioclase, An24, was analysed. The meteorite is a ureilite.

Data from:
  Table 2
  Line 1893:
Origin or pseudonym:Meteorite City
Mass (g):91.3
Class:Ur "pm?"
Weathering grade:Be
Fayalite (mol%):13-21
Ferrosilite (mol%):9-13
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References: Published in Antarctic Meteorite Newsletter 12(3) (1989), 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° 11'S, 157° 10'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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