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Elephant Moraine 92004
Basic information Name: Elephant Moraine 92004
     This is an OFFICIAL meteorite name.
Abbreviation: EET 92004
Observed fall: No
Year found: 1992
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 34.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(2)  (1993)  Eucrite
AMN 17(1)  (1994)  Eucrite-unbr
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 92 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 16(2):

Sample No.: EET92004

Location: Elephant Moraine

Dimensions (cm): 3.5 x 2.5 x 3.1

Weight (g): 34.7

Meteorite Type: Unbrecciated Eucrite

 

Macroscopic Description: Cecilia Satterwhite

Eight percent of the exterior of this achondrite is covered with shiny, black fusion crust Some areas have flow lines present. Areas without fusion crust show a gray matrix with abundant white minerals. Minor weathering is visible. Chipping EET92004 revealed an interior that contains rounded blebs of dark green to black pyroxene and white plagioclase with fine-grained interstitial gray material. Oxidation is heavy in one area. A black glassy vein runs through the interior.

 

Thin Section (,7) Description: Brian Mason

The section shows an aggregate of subequal amounts of plagioclase and pyroxene, with a trace of opaque material; it has a gabbroic texture, with subhedral to anhedral grains averaging about 0.6 mm across. Moderate shock is indicated by granulation of the pyroxene crystals and undulose extinction of the plagioclase. Pyroxene compositions cluster around Wo2Fs57, with a few more calcic grains ranging up to Wo18Fs43; plagioclase composition is An90-94. The meteorite is an unbrecciated eucrite.

 

Data from:
  MB76
  Table 2
  Line 2846:
Origin or pseudonym:Northern Ice Patch
Mass (g):34.7
Class:Eu "ub"
Weathering grade:A/B
Ferrosilite (mol%):43-58
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 16(2) (1993), 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° 1' 54"S, 156° 1' 10"E)
Note: the NHM and MetBase coordinates are 35.1 km apart

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