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Elephant Moraine 83322
Basic information Name: Elephant Moraine 83322
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83322
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 14.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  E4
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 137 approved meteorites classified as EH3.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: EET83322

Location: Elephant Moraine

Weight (g): 14.3

Field No.: 2849

Dimensions (cm): 3 x 2.5 x 2 Meteorite Type: E4 Chondrite

 

Macroscopic Description: Roberta Score

One small patch of fusion crust is present on the iridescent reddish-brown exterior of this stone. Interior is black and speckled with small (<1 mm) inclusions. Abundant black minerals show well-developed crystal faces. Metal may be present. Minor oxidation haloes are visible. Stone is very cohesive.

 

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 0.9 mm in diameter, and consist of granular pyroxene, except for a few made up of nickel-iron and sulfide. A minor amount of brown limonitic staining is present. Microprobe analyses show that the pyroxene is close to MgSiO3 in composition (FeO 0.2-1.7, mean 0.6%; Al2O3 0.04-1.1, mean 0.3%; CaO 0.1-0.5, mean 0.3%; TiO2 0.04-0.24, mean 0.05%; MnO 0.04-0.24, mean 0.13%). The nickel-iron contains about 2.2% Si. Since part of the pyroxene is polysynthetically twinned clinoenstatite, the meteorite is classified as an E4 chondrite. It is similar to EET83307 and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 1584:
Origin or pseudonym:Main icefield
Mass (g):14.3
Class:EH3
Weathering grade:A/B
Ferrosilite (mol%):0.2-2
Comments:83307 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 17' 36"S, 157° 14' 17"E)
Note: the NHM and MetBase coordinates are 12.4 km apart

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