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Elephant Moraine 92023
Basic information Name: Elephant Moraine 92023
     This is an OFFICIAL meteorite name.
Abbreviation: EET 92023
Observed fall: No
Year found: 1992
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 21.8 g
Antarctic Meteorite Newsletter:  AMN 17(1)  (1994)  Eucrite-unbr
Meteoritical Bulletin:  MB 79  (1996)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 140 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from AMN 17(1):

Sample No.: EET92023

Location: Elephant Moraine

Dimensions (cm): 3.0 x 2.5 x 2.0

Weight (g): 21.8

Meteorite Type: Eucrite (unbrecciated)


Macroscopic Description : Carol Schwarz

About sixty percent of this unbrecciated eucrite is covered with thin black fusion crust which has worn away in areas. The interior is coarse-grained consisting of about 50% white (plagioclase) and 50% yellow-gray minerals. There is only minor weathering apparent.


Thin Section (,2) Description: Brian Mason

The section shows a gabbroic texture, an equigranular intergrowth of subhedral to anhedral pyroxene and plagioclase (mean grain size is about 1 mm), with a small amount of opaque material. The pyroxene is a pigeonite of fairly uniform composition, averaging Wo10Fs45; plagioclase composition is An88-91. The meteorite is an unbrecciated eucrite; in texture and mineral compositions it resembles Moore County, but the pyroxene does not show the complex exsolution pattern of Moore County pyroxene.


Writeup from AMN 33(1):
EET 92023 this sample was suggested to be polymict based on high siderophile element concentrations, but there is no evidence for breccciation in any sections. Instead it appears that the higher metal contents are contributing to the high siderophile element concentrations. Therefore, this sample remains classified as an unbrecciated eucrite. It is possible that it is a clast from a mesosiderite, but this would require additional studies to verify.
Data from:
  Table 2
  Line 223:
Origin or pseudonym:Northern Ice Patch
Mass (g):21.8
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):41-46
Search for specimens in the Smithsonian Institution collection (U.S.):   
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References: Published in Antarctic Meteorite Newsletter 17(1) (1994), JSC, Houston
Published in Antarctic Meteorite Newsletter 33(1) (2010), JSC, Houston
Published in Meteoritical Bulletin, no. 79, MAPS 31, A161-A174 (1996)
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     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 2' 48"S, 156° 26' 43"E)
Note: the NHM and MetBase coordinates are 24.6 km apart

     This is 1 of 44549 approved meteorites from Antarctica (plus 3803 unapproved names)
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