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Elephant Moraine 92012
Basic information Name: Elephant Moraine 92012
     This is an OFFICIAL meteorite name.
Abbreviation: EET 92012
Observed fall: No
Year found: 1992
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 17(1)  (1994)  LL7
Meteoritical Bulletin:  MB 79  (1996)  LL7
NHM Catalogue:  5th Edition  (2000)  LL7
MetBase:  v. 7.1  (2006)  LL7
Recommended:  LL7    [explanation]

This is 1 of 60 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 17(1):

Sample No.: EET92012; 92013; 92016

Location: Elephant Moraine

Dimensions (cm): 1.1 x 0.9 x 0.8; 2.0 x 1.5 x 1.4; 2.1 x 1.5 x 1.5

Weight (g): 2.0; 9.9; 10.1

Meteorite Type: LL7 chondrite

The exterior surfaces of these specimens are greenish-gray in color. Sulfide grains are visible on the exterior. The medium grained, interior matrices are light to medium gray with numerous light and dark colored mineral grains scattered throughout.

 

Thin Section (EET92012,2; 92013,2; 92016,2) Description: Brian Mason

These sections are so similar that a single description suffices; the meteorites are certainly paired. They show an aggregate of small anhedral olivine and pyroxene grains (grain size 0.05-0.1 mm), with a few coarser aggregates which appear to be vestigial chondrules. Minor amounts of nickel-iron and troilite are present. Microprobe analyses show olivine and pyroxene of uniform composition: olivine, Fa30; orthopyroxene, Wo2Fs24. One grain of diopside, Wo40Fs9, was analyzed. A little plagioclase, An10, is present. The meteorite is classified as an LL7 chondrite.

 

Data from:
  MB79
  Table 2
  Line 212:
Origin or pseudonym:Northern Ice Patch
Mass (g):2
Class:LL7
Weathering grade:A/B
Fayalite (mol%):30
Ferrosilite (mol%):24
Comments:92012 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 17(1) (1994), JSC, Houston
Published in Meteoritical Bulletin, no. 79, MAPS 31, A161-A174 (1996)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 4' 55"S, 156° 1' 16"E)
Note: the NHM and MetBase coordinates are 32.7 km apart

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