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Elephant Moraine 83225
Basic information Name: Elephant Moraine 83225
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83225
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 44 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 515 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: EET83225

Location: Elephant Moraine

Weight (g): 44.0

Field No.: 2798

Dimensions (cm): 5 x 2.5 x 2.5

Meteorite Type: Ureilite

 

Macroscopic Description: Roberta Score

The fusion crust on this ureilite is very thin. The exterior surfaces are smooth and have a dull sheen. The overall exterior color is brownish-black. Crystalline grains with well-developed crystal faces make up the interior. Most of the center of this achondrite is heavily oxidized giving it a reddish-brown color.

 

Thin Section (,6) Description: Jeremy Delaney

Medium to coarse-grained ureilite with clean crystals of olivine and pyroxene. Thin section is pyroxene-rich with 120° triple junctions being quite common. Grain boundaries coated with dark material containing vein-like metal, graphite and yellow/red cathodoluminescent phase; probably diamond. Tiny metallic inclusions also occur in some pyroxene and olivine grains. Thin section shows a clear dimensionally-dependent preferred orientation of both pyroxene and olivine suggesting cumulus texture. Olivine is Fo87-92 and pyroxene is pigeonite En78-79Wo10.5.

Data from:
  MB76
  Table 2
  Line 1490:
Origin or pseudonym:Main icefield
Mass (g):44
Class:Ur
Weathering grade:B/C
Fayalite (mol%):13
Ferrosilite (mol%):15
Comments:26Al=54±4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), 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° 17' 32"S, 157° 15' 51"E)
Note: the NHM and MetBase coordinates are 12.4 km apart

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