Meteoritical Bulletin: Entry for Elephant Moraine 87548

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Elephant Moraine 87548

Basic information

Name: Elephant Moraine 87548
This is an OFFICIAL meteorite name.
Abbreviation: EET 87548
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 560 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 12(1)	(1989)	Eucrite
	AMN 17(1)	(1994)	Eucrite-Mg-rich
Meteoritical Bulletin:	MB 76	(1994)	Eucrite-Mg-rich
NHM Catalogue:	5th Edition	(2000)	Eucrite-Mg rich
MetBase:	v. 7.1	(2006)	Eucrite-cm
Recommended:			Eucrite-Mg rich [explanation]

This is 1 of 3 approved meteorites classified as Eucrite-Mg rich. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

help

Writeup from AMN 12(1):

Sample No.: EET87548

Location: Elephant Moraine

Weight(g): 560.2

Field No.: 4805

Dimensions (cm): 11.5x6.5x5.5

Meteorite Type: Eucrite

Macroscopic Description: Cecilia Satterwhite

The exterior of this achondrite is greenish/gray and has a coarse-grained texture with patches of black, shiny fusion crust. The interior is medium-gray with some weathered plagioclase visible.

Thin Section, (,5) Description: Brian Mason

The section shows an aggregate of anhedral pyroxene and plagioclase grains (grain size 0.3-1.8 mm), in proportion pyroxene:plagioclase approximately 2:1, with accessory chromite, troilite, and nickel-iron. Individual grains of pyroxene and plagioclase are deformed but not granulated. The pyroxene is hypersthene (Wo2Fs45) with relatively coarse (0.04 mm wide) lamellae of exsolved augite (Wo44Fs17); mean composition of pyroxene is Wo11 Fs38. Plagioclase is fairly uniform in composition, An89-92. The meteorite is a eucrite, intermediate in composition between Binda and Moore County.

Data from:
  MB76
  Table 2
  Line 1721:

Origin or pseudonym:	Main icefield
Mass (g):	560.2
Class:	Eu "mg"
Weathering grade:	B/C
Ferrosilite (mol%):	16-45
Comments:	NTL=2.3±0.5

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 12(1) (1989), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)

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Geography:

Antarctica

Antarctica

Coordinates:
Catalogue of Meteorites:	(76° 11'S, 157° 10'E)
Recommended::	(76° 16' 17"S, 157° 12' 10"E)

Note: the NHM and MetBase coordinates are 9.9 km apart

Statistics:
This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names)

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