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Elephant Moraine 87511
Basic information Name: Elephant Moraine 87511
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87511
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 65.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Ureilite
AMN 17(1)  (1994)  Ureilite-augite-bearing
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-augite-bearing
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 514 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 11(2):

Sample No.: EET87511; 87523; 87717

Location: Elephant Moraine

Weight (g): 65.1; 27.5; 27.2

Field No.: 4814; 4590; 4458

Dimensions (cm): 4.5x5x2.5; 3x2.5x2; 4x3x2

Meteorite Type: Ureilite

 

Macroscopic Description: Roberta Score and René Martinez,

Two small patches of dull black fusion crust remain on EET87511. The exterior surface is greenish in color due to weathering. The interior is black with abundant platy minerals and some plagioclase. Oxidation occurs between the minerals. EET87523 is fairly coarse grained with a high proportion of mafic minerals. There is heavy oxidation in some areas but rust is absent in others. A few small patches of fusion crust remain. The same description applies to EET87717.

 

Thin Section (EET87511,2; 87523,5; 87717,4) Description: Brian Mason

EET87511,2 shows an aggregate of subhedral to anhedral grains (0.2-2.5 mm) of olivine with minor amounts of pyroxene. The grains are rimmed with black carbonaceous material containing a little nickel-iron and troilite. Micro-probe analyses of EET87511 give the following compositions: olivine, Fa14;

pyroxene, Wo5Fs12 ; one grain of augite, Wo36Fs9 with 4.7% Al2O3 was analyzed. The meteorite is relatively unshocked. EET87523,5 and EET87717,4 are very similar in texture and mineral compositions to EET87511. These meteorites are ureilites and are probably paired.

Data from:
  MB76
  Table 2
  Line 1685:
Origin or pseudonym:Meteorite City
Mass (g):65.1
Class:Ur "aug"
Weathering grade:B
Fayalite (mol%):15
Ferrosilite (mol%):12
Comments:NTL=1.5±0.4; 87511 pairing group
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° 11'S, 157° 10'E)

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