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Elephant Moraine 90004 | |||||||||||||||||||||||||
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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: 56.7 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 214 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 | ||||||||||||||||||||||||
Writeup |
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.
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Data from: MB76 Table 2 Line 2037: |
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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: |
Statistics: This is 1 of 44274 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
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