Meteoritical Bulletin: Entry for Elephant Moraine 87520

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Elephant Moraine 87520

Basic information

Name: Elephant Moraine 87520
This is an OFFICIAL meteorite name.
Abbreviation: EET 87520
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 52.3 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 11(2)	(1988)	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

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Writeup from AMN 11(2):

Sample No.: EET87520

Location: Elephant Moraine

Weight (g): 52.3

Field No.: 4576; 4586

Dimensions (cm): 4.5 x 2.5 x 2.5

Meteorite Type: Unbrecciated Eucrite

Macroscopic Description: Roberta Score

This specimen consists of two pieces that fit together. The matrix is dark and fine-grained. It has an igneous texture - graphic intergrowth of coarse plagioclase laths and mafic minerals. Some metal is visible and oxidation is moderate throughout the matrix.

Thin Section (,6) Description: Brian Mason

The section shows a granular aggregate of subequal amounts of pyroxene and plagioclase (grains 0.6 - 1.8 mm in maximum dimension), with accessory tridymite and chromite. Most of the pyroxene is pigeonite (average composition Wo5Fs50), but a small amount of augite (Wo37Fs27) is present. Some of the pigeonite grains show narrow exsolution lamellae. Plagioclase composition is An89. The meteorite is an unbrecciated eucrite; it is very similar in texture and mineral compositions to Moore County.

Data from:
  MB76
  Table 2
  Line 1694:

Origin or pseudonym:	Meteorite City
Mass (g):	52.3
Class:	Eu "mg"
Weathering grade:	B
Ferrosilite (mol%):	27-53

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
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References:

Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 11'S, 157° 10'E)

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

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Revision
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