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Elephant Moraine 83212
Basic information Name: Elephant Moraine 83212
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83212
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 402 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 341 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: EET83212

Location: Elephant Moraine

Weight (g): 402.1

Field No.: 2877

Dimensions (cm): 7 x 6 x 7

Meteorite Type: Polymict Eucrite

 

Macroscopic Description: Roberta Score

The exterior color of this achondrite ranges from medium gray to brown-gray with the exception of thin dull black fusion crust that covers two surfaces. The interior is gray in color and rich in clasts that may include eucritic and black fine-grained materials. A one-centimeter-thick weathering rind was exposed when the stone was chipped. The stone is similar to other 1983 Elephant Moraine eucrites.

 

Thin Section (,2) Description: Jeremy Delaney

This thin section of a polymict eucrite is dominated by a single, very fine-grained mafic clast of the type common in both Allan Hills and Elephant Moraine polymict eucrites. Numerous small mineral clasts are included in this clast. Several outer parts of this fine-grained clast that border the coarser-grained matrix are darker, either because of fine-grain size or the presence of Fe-oxide weathering products. Some mineral clasts have dark fine-grained "chill zones" around them. Pyroxene clasts within this dark clast have a variety of coarse and fine exsolution while feldspar clasts are partly maskelynitized. One feldspar clast has a glassy core with a feldspar rim that mimics the shape of this clast. Heating by the mafic melt that quenched to form the dark clast apparently devitrified previously shocked feldspar grains. The "normal" breccia of 83212 contains breccia clasts, basaltic clasts with clouded pyroxene and intergranular texture, granular mafic clasts with recrystallized pyroxene, and some fine exsolution with some glassy material present. No orthopyroxene was observed.

Data from:
  MB76
  Table 2
  Line 1477:
Origin or pseudonym:Main icefield
Mass (g):402.1
Class:Eu "pm"
Weathering grade:B
Ferrosilite (mol%):18-53
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), 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° 17' 15"S, 157° 14' 19"E)
Note: the NHM and MetBase coordinates are 11.8 km apart

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