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Elephant Moraine 90020
Basic information Name: Elephant Moraine 90020
     This is an OFFICIAL meteorite name.
Abbreviation: EET 90020
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 154 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  Eucrite
AMN 17(1)  (1994)  Eucrite-unbr
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 90 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 14(2):

Sample No.: EET90020

Location: Elephant Moraine

Field Number: 7245

Dimensions (cm): 5.3 x 4.5 x 4.8

Weight (g): 154.0

Meteorite Type: Eucrite

 

Macroscopic Description: Robbie Marlow

Thin, shiny, black fusion crust covers 80% of the exterior of this sample. No fractures exist. Cleaving this achondrite revealed an interior with coarse-grained matrix containing an even distribution of white laths. The specimen is coherent and weathering is minimal.

 

Thin Section (,7) Description: Brian Mason

The section shows an equigranular aggregate (average grain size 0.6 mm) of plagioclase laths and anhedral to subhedral pyroxene grains, with a little opaque material. The pyroxene is pale brown and weakly pleochroic. Pyroxene compositions show a continuous range from Wo5Fs55 to Wo23Fs40, with relatively uniform En content. Plagioclase composition is An86-92. Tridymite is present as an accessory. The meteorite is a eucrite.

 


Writeup from AMN 33(1):
EET 90020 there are some literature reports of hand sample regions that look fine grained and possibly brecciated, but all thin sections of this sample exhibit no brecciation, but instead have a fine grained and course grained portions. Both of these have triple junctions boundaries indicating heating to metamorphic conditions. Additionally, vugs are reported in some areas. Nonetheless the classification as an unbrecciated eucrites stands.
Data from:
  MB76
  Table 2
  Line 2053:
Origin or pseudonym:Texas Bowl
Mass (g):154
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):40-55
Comments:NTL=1.4±0.1
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 14(2) (1991), JSC, Houston
Published in Antarctic Meteorite Newsletter 33(1) (2010), 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' 9"S, 156° 24' 49"E)
Note: the NHM and MetBase coordinates are 22.2 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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