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Elephant Moraine 83307
Basic information Name: Elephant Moraine 83307
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83307
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.8 g
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  E4
AMN 17(1)  (1994)  EH3
Meteoritical Bulletin:  MB 76  (1994)  EH3
NHM Catalogue:  5th Edition  (2000)  EH3
MetBase:  v. 7.1  (2006)  EH3
Recommended:  EH3    [explanation]

This is 1 of 142 approved meteorites classified as EH3.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Writeup from AMN 9(1):

Sample No.: EET83307

Location: Elephant Moraine

Weight (g): 4.8

Field No.: 2833

Dimensions (cm): 2 x 1 x 1

Meteorite Type: E4 Chondrite


Macroscopic Description: Roberta Score

Some fusion crust remains on this otherwise extensively weathered stone.


Thin Section (,2) Description: Brian Mason

Chondrules and chondrule fragments are fairly abundant, and are set in a granular matrix of pyroxene, nickel-iron, and sulfides. The chondrules range up to 1.3 mm in diameter, and consist of granular pyroxene, sometimes with a little olivine, but a few are made up of nickel-iron and sulfide. Brown limonitic staining is present throughout the section. Microprobe analyses show that the pyroxene is close to MgSiO3 in composition (FeO 0.5-4.5, mean 1.5%; Al2O3 0.1-0.8, mean 0.3%; CaO 0.1-8.4, mean 0.2%; TiO2 0.02-0.11, mean 0.050; MnO 0.02-0.4, mean 0.18%). Three olivine grain were analyzed, FeO ranging from 4.3 to 5.1%. The nickel-iron contains about 2.4% Si. Since part of the pyroxene is polysynthetically twinned clinoestatite, the meteorite is classified as an E4 chondrite; It is similar to EET83322, and the possibility of pairing should be considered.

Data from:
  Table 2
  Line 1570:
Origin or pseudonym:Main icefield
Mass (g):4.8
Weathering grade:C
Fayalite (mol%):2-5
Ferrosilite (mol%):0.5-5
Comments:83307 pairing group
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References: Published in Antarctic Meteorite Newsletter 9(1) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 16' 34"S, 157° 12' 39"E)
Note: the NHM and MetBase coordinates are 10.4 km apart

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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