Meteoritical Bulletin: Entry for Elephant Moraine 99408

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Elephant Moraine 99408

Basic information

Name: Elephant Moraine 99408
This is an OFFICIAL meteorite name.
Abbreviation: EET 99408
Observed fall: No
Year found: 1999
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 147.7 g

Classification
history:

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 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Writeup

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Writeup from AMN 23(2):

Sample No.:	EET 99400; 99408
Location:	Elephant Moraine
Dimensions (cm):	7.5x4.5x3.5; 8.0x4.5x2.0
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


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 (Fs_17-27Wo_0-1), pigeonite (Fs_42-50Wo_13-15) and augite (Fs₂₄Wo₃₇). The Fe/Mn ratio of pyroxene is ~30. Plagioclase is An_80-94Or_0-1. The meteorites are howardites.

Data from:
  MB85
  Table A1
  Line 28:

Origin or pseudonym:	Main icefield
Mass (g):	147.7
Class:	How
Weathering grade:	A/B
Ferrosilite (mol%):	21-27
Comments:	99400 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

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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Photos:

Credit	Photos
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

Geography:

Antarctica

Antarctica

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

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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