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Elephant Moraine 83250
Basic information Name: Elephant Moraine 83250
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83250
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 11.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
Recommended:  CM2    [explanation]

This is 1 of 541 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: EET83250

Location: Elephant Moraine

Weight (g): 11.5

Field No.: 1441

Dimensions (cm): <2

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Roberta Score

When EET83250 was first removed from its container, it existed in many pieces that could not be reassembled. It is, however, possible to distinguish between the exterior (many pieces containing fusion crust and evaporite deposit) and the interior surfaces, which are black with speckles of white inclusions. Rust spots and some evaporite deposits are visible on some of the interior pieces.

 

Thin Section (,3) Description: Brian Mason

Only a few chondrules and chondrule fragments are present; the bulk of the meteorite consists of brown to black semi-opaque matrix, enclosing numerous small (0.1-mm and less) colorless birefringent grains, mostly olivine. The matrix also contains trace amounts of finely dispersed nickel-iron and sulfides. Well-preserved fusion crust rims part of the section. Microprobe analyses show most of the olivine close to forsterite in composition, with a few iron-rich grains (Fa0.3 - Fa22), mean Fa4). Pyroxene grains are rare; composition range is Fs2 - Fs14. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 1513:
Origin or pseudonym:Main icefield
Mass (g):11.5
Class:C2
Weathering grade:Be
Fayalite (mol%):0.3-22
Ferrosilite (mol%):2-14
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° 18' 13"S, 157° 10' 34"E)
Note: the NHM and MetBase coordinates are 13.4 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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