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Elephant Moraine 90234
Basic information Name: Elephant Moraine 90234
     This is an OFFICIAL meteorite name.
Abbreviation: EET 90234
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 8.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(2)  (1992)  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 162 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 15(2):

Sample No.: EET90234; 90247; 90428

Location: Elephant Moraine

Field Number: 7320; 7334;.7287

Dimensions (cm): 2.3 x 2.1 x 1.1; 4 x 2.5 x 2.5; 2.0 x 1.7 x 0.7

Weight (g): 8.5; 37.1; 7.3

Meteorite Type: C4 chondrite

 

Macroscopic Description: Robbie Marlow

Fractured, dull, black fusion crust covers up to 50% of each of these carbonaceous chondrite fragments. Areas devoid of fusion crust are greenish gray in color. EET90234 and 90248 are more weathered than 90247. 90234 and 90248 have a dark gray interior and contain evaporite deposit. 90247 is light gray, has a thin weathering rind and several millimeter-sized dark gray inclusions.

 

Thin Section (EET90234,5) Description; Brian Mason

A few well-defined chondrules, up to 1.2 mm across, are present, but most of the section consists of anhedral olivine grains, 0.05-0.1 mm across, with minor plagioclase and opaques. The opaques consist largely of magnetite and pentlandite; nickel-iron is absent. Microprobe analyses show olivine of uniform composition, Fa28; one grain of diopside, Wo46 Fs7, and one grain of plagioclase, An49, were analyzed. The meteorite is classified as a C4 chondrite, and probably belongs to the EET87507 pairing group. EET90247,3 and EET90428,2 are similar in all respects.

 

Data from:
  MB76
  Table 2
  Line 2266:
Origin or pseudonym:Texas Bowl
Mass (g):8.5
Class:CK5
Weathering grade:Ae
Fayalite (mol%):28
Comments:87507 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(2) (1992), 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° 15' 57"S, 156° 24' 36"E)
Note: the NHM and MetBase coordinates are 22.1 km apart

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