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Elephant Moraine 99402
Basic information Name: Elephant Moraine 99402
     This is an OFFICIAL meteorite name.
Abbreviation: EET 99402
Observed fall: No
Year found: 1999
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 180.5 g
NHM Catalogue:  5th Edition  (2000)  Brachinite
Antarctic Meteorite Newsletter:  AMN 23(2)  (2000)  Brachinite
Meteoritical Bulletin:  MB 85  (2001)  Brachinite
MetBase:  v. 7.1  (2006)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 60 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Writeup from AMN 23(2):
Sample No.: EET 99402; 99407
Location: Elephant Moraine
Dimensions (cm): 6.0x4.5x4.0;
Weight (g): 180.478; 60.043
Meteorite Type: Brachinites
    EET99402 EET99407

Macroscopic Description: Kathleen McBride
Both of these meteorites' exterior surfaces are rough, black and granular in appearance. EET99407 has some gray-black fusion crust. The interiors have a granular crystalline texture that is somewhat friable. The matrix is gray to black in color with dark gray crystalline mineral grains cemented by fine rusty material. Some areas appear like they've been melted together.

Thin Section (, 6;, 4) Description: Tim McCoy

EET 99402 EET 99407
EET99402 EET99407
These meteorites are so similar that a single description suffices. The sections are composed dominantly of equant olivine (Fa35; 0.2-1.5 mm in diameter) with 120ยบ triple junctions. Calcic pyroxene (Fs10-12; Wo43-46) and plagioclase (An38-40; Or0.1-0.3) comprise a few percent of the meteorite each and are heterogeneously distributed. Minor chromite and iron sulfides are also present. The rocks are moderately shocked, with planar fractures in olivine and mosaicism in feldspar. The meteorites are probably brachinites.

Oxygen Isotope analysis: T.K.Mayeda and R.N.Clayton.
Our analysis for EET 99402 gives: delta-18=+3.57, delta-17=+1.65. This is indistinguishable from Brachina, for which the values are: +3.48, +1.61 (Clayton and Mayeda, 1996).

Data from:
  Table A1
  Line 22:
Origin or pseudonym:Main icefield
Mass (g):180.5
Weathering grade:B
Fayalite (mol%):35
Comments:99402 pairing group
Plots: O isotopes:  
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References: Published in Antarctic Meteorite Newsletter 23(2) (2000), JSC, Houston
Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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Photographs from AMN:
Photograph from unknown source A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
Dr Carlton Allen, JSC-KT, NASA   

     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 11'S, 157° 10'E)

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