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Elephant Moraine 87528
Basic information Name: Elephant Moraine 87528
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87528
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 40.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Howardite
Meteoritical Bulletin:  MB 76  (1994)  Howardite
NHM Catalogue:  5th Edition  (2000)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from AMN 11(2):

Sample No.: EET87528

Location: Elephant Moraine

Weight (g): 40.5

Field No.: 2153

Dimensions (cm): 3 x 3 x 2.5

Meteorite Type: Howardite

 

Macroscopic Description: René Martinez

This brecciated achondrite retains black fusion crust on about 50% of its exterior. Fractured surfaces appear fresh. Inclusions are mostly small mineral fragments of either pyroxene or plagioclase, but there are two conspicuous clasts: one about 1 cm x 0.5 cm and the other about 0.5 x 0.5 cm in cross-section. One was sampled for thin sectioning. The interior matrix is light gray.

 

Thin Section (,8; ,10) Description: Brian Mason

EET87528,8 is a microbreccia of pyroxene (both orthopyroxene and pigeonite) and plagioclase clasts up to 2.2 mm in maximum dimension in a matrix of comminuted pyroxene and plagioclase. Orthopyroxene is more abundant than pigeonite, and occurs as larger clasts. EET87528,10 consists mainly of a large (9 x 7 mm) diogenite clast, bordered by material like 87528,8. Pyroxene compositions show the following range: Wo1-24, Fs21-60, En31-76; pyroxene in the diogenite clast is slightly variable, averaging Wo2Fs23. Plagioclase composition is An80-95. The meteorite is a howardite, but appears to differ from EET87503 and other howardites in that group.

Data from:
  MB76
  Table 2
  Line 1701:
Origin or pseudonym:Texas Bowl
Mass (g):40.5
Class:How
Weathering grade:A
Fayalite (mol%):31-33
Ferrosilite (mol%):21-60
Comments:NTL=5.1±0.8
Catalogs:
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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
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 16' 23"S, 156° 28' 23"E)
Note: the NHM and MetBase coordinates are 21 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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