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Elephant Moraine 90020 | |||||||||||||||||||||||||
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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: 154 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 136 approved meteorites classified as Eucrite-unbr. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||
Writeup |
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.
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Data from: MB76 Table 2 Line 2053: |
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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: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
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