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Elephant Moraine 99400
Basic information Name: Elephant Moraine 99400
     This is an OFFICIAL meteorite name.
Abbreviation: EET 99400
Observed fall: No
Year found: 1999
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 234 g
NHM Catalogue:  5th Edition  (2000)  Howardite
Antarctic Meteorite Newsletter:  AMN 23(2)  (2000)  Howardite
Meteoritical Bulletin:  MB 85  (2001)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeup from AMN 23(2):
Sample No.: EET 99400; 99408
Location: Elephant Moraine
Dimensions (cm): 7.5x4.5x3.5;
Weight (g): 233.8; 147.736
Meteorite Type: Howardite
    EET99400 EET99408

Macroscopic Description: Kathleen McBride
Both of these achondrites have black shiny fusion crust with polygonal fractures covering 20% of the exterior. The interior is concrete gray with angular to sub angular black, white, tan and gray clasts. Olivine crystals are visible. There is no visible metal, but thin minor fractures are present.

Thin Section (, 5) Description: Tim McCoy

EET 99400 EET 99408
EET99400 EET99408
These meteorites are so similar that a single description suffices. The sections show a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic and pyroxenitic clasts ranging up to 1 mm. Pyroxene consists of orthopyroxene (Fs17-27Wo0-1), pigeonite (Fs42-50Wo13-15) and augite (Fs24Wo37). The Fe/Mn ratio of pyroxene is ~30. Plagioclase is An80-94Or0-1. The meteorites are howardites.

Data from:
  Table A1
  Line 20:
Origin or pseudonym:Main icefield
Mass (g):233.8
Weathering grade:B
Ferrosilite (mol%):17-22
Comments:99400 pairing group
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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 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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