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Elephant Moraine 90004
Basic information Name: Elephant Moraine 90004
     This is an OFFICIAL meteorite name.
Abbreviation: EET 90004
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 56.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  C4
AMN 17(1)  (1994)  CK5
Meteoritical Bulletin:  MB 76  (1994)  CK5
NHM Catalogue:  5th Edition  (2000)  CK5
MetBase:  v. 7.1  (2006)  CK5
Recommended:  CK5    [explanation]

This is 1 of 158 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Writeuphelp
Writeup from AMN 14(2):

Sample No.: EET90004; EET90007; EET90015; EET90018; EET90022

Location: Elephant Moraine

Field Number: 6502; 7149; 6803; 6497; 6521

Dimensions (cm): 4.5 x 3 x 2.8; 4.5 x 4.3 x 3.5; 4.8 x 3.9 x 3.0; 5 x 3.5 x 1.4; 2.9 x 1.8 x 2.1

Weight (g): 56.7; 131.0; 86.8; 31.4; 15.5

Meteorite Type: Carbonaceous C4

 

Macroscopic Description: Robbie Marlow

Dull brown or black fusion crust covers approximately half of all 5 specimens. Evaporite deposits are present on all. EET90015, and 90018 have white deposit; 90004 and 90007 have more abundant light green colored deposit; and 90022 has abundant thick, fluffy looking deposit with euhedral crystals. The original hydrated color of the deposit on 90022 was turquoise which turned to a lighter green after it was dried. The interior of all specimens is medium gray with minor amounts of metal and a few white inclusions. Weathering of the interior is minimal.

 

Thin Section (EET90004,4; 007,5; 015,6; 018,3; 022,4) Description: Brian Mason

The sections of these meteorites are all very similar and a single description applies to all. They show an aggregate of small (average about 0.02 mm) olivine grains and minor opaque material; some of the opaque material is finely dispersed and gives the sections a gray color. Occasional chondrules, up to 1.2 mm across, are present. Fusion crust is present on 90007, 90015, and 90022. Olivine composition is Fa29; a little plagioclase of variable composition, An33-45, is present; one grain of diopside, Wo40Fs11, was analyzed. The opaque material is mainly magnetite with a little troilite and pentlandite. The meteorites are 04 chondrites; they are very similar in texture and mineral compositions to the EET 87507 group of C4 chondrites, and the possibility of pairing should be considered.

 

Data from:
  MB76
  Table 2
  Line 2037:
Origin or pseudonym:Texas Bowl
Mass (g):56.7
Class:CK5
Weathering grade:A/Be
Fayalite (mol%):29
Comments:87507 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 14(2) (1991), 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' 18"S, 156° 27' 35"E)
Note: the NHM and MetBase coordinates are 22.1 km apart

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