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Elephant Moraine A79004
Basic information Name: Elephant Moraine A79004
     This is an OFFICIAL meteorite name.
Abbreviation: EETA79004
This meteorite may also be called Elephant Moraine 79004 (EET 79004) in publications.

Observed fall: No
Year found: 1979 or 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 390 g
Antarctic Meteorite Newsletter:  AMN 3(3)  (1980)  Eucrite
AMN 13(1)  (1990)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 391 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from AMN 3(3):
This text was reprinted from AMN 3(3) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: EETA79004

Location: Elephant Moraine

Field No.: 1037

Weight (gms): 390.3

Meteorite Type: Eucrite


Physical Description: Roberta Score

Dimensions: 11 x 6.5 x 4 cm.  This oblong achondrite is covered with a thin dull fusion crust on all but two surfaces. The exterior matrix appears medium to dark gray in color and contains numerous clasts as large as 2 cm in diameter. Most of the larger clasts are dark in color though light colored clasts do exist. Vugs are apparent in this meteorite. Most are concentrated on surface in an area devoid of fusion crust. These vugs are as deep as 1 cm, as wide as 0.5 cm. The interior matrix is light gray in color with many inclusions. The one clast seen on the exterior extends 2.0x0.8 cm into the interior and appears to be easily plucked out. Many of the clasts in this achondrite will be easily plucked out. Several spots of severe oxidation are visible.


Petrographic Description: Arch Reid

Thin section shows a breccia dominantly made up of pyroxene and feldspar fragments in a fine-grained matrix. Much of the matrix is dark, fine-grained and may be recrystallized. The clasts are generally angular but some have less well-defined outlines and may have undergone reheating. Mineral fragments range up to 1.3 mm and comprise pyroxene (some showing exsolution), feldspar and less common opaques. Angular lithic clasts include fragments of very fine grained eucrite (2-5 mm), fine grained eucrite, and dark aphanitic material (1.6 mm). Pyroxene compositions show a range in Ca contents with little variation in Mg/Fe (Wo2En45Fs53 to Wo40En36Fs24 with low Ca compositions most abundant, in the few grains analysed). Feldspars analysed range from Or1Ab6An93 to Or1Ab14An85. The meteorite is classed as a eucrite.

Data from:
  Table 2
  Line 1441:
Origin or pseudonym:Main icefield
Mass (g):390.3
Class:Eu "pm"
Weathering grade:B
Ferrosilite (mol%):30-61
Comments:NTL=14±4; 79004 pairing group
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References: Published in Antarctic Meteorite Newsletter 3(3) (1980), 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° 17' 30"S, 157° 14' 22"E)
Note: the NHM and MetBase coordinates are 12.2 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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