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Elephant Moraine 83309
Basic information Name: Elephant Moraine 83309
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83309
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 60.8 g
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  Achondrite-unique
AMN 13(1)  (1990)  Ureilite
AMN 17(1)  (1994)  Ureilite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-pmict
NHM Catalogue:  5th Edition  (2000)  Ureilite-pmict
MetBase:  v. 7.1  (2006)  Ureilite-pmict
Recommended:  Ureilite-pmict    [explanation]

This is 1 of 31 approved meteorites classified as Ureilite-pmict.   [show all]
Search for other: Achondrites, Ureilites
Writeup from AMN 9(1):

Sample No.: EET83309

Location: Elephant Moraine

Weight (g): 60.8

Field No.: 1444

Dimensions (cm): 4 x 4 x 2.5

Meteorite Type: Achondrite


Macroscopic Description: Roberta Score

Some fusion crust remains on this weathered stone. Though the interior is extensively oxidized, a few platy minerals with well-developed crystal faces can be distinguished.


Thin Section (,2) Description: Brian Mason

This meteorite is a microbreccia, consisting largely of olivine clasts (up to 3 mm in maximum dimension), with a lesser amount of pyroxene and a few small plagioclase clasts. Nickel-iron and troilite are present only in traces. One small clast appears to be a fragment of a barred olivine chondrule. Brown limonitic staining pervades the section. Olivine compositions range from Fa8 to Fa25, with most between Fa15 and Fa23. The olivine has unusually high calcium (CaO 0.2-0.5%) and chromium (Cr2O3 0.5-0.9%) contents. Most of the pyroxene is low-Ca, around Wo5Fs18, but a little diopside (Wo39Fs6) is present. Plagioclase compositions show a considerable range, An10-50. The meteorite is classified as an achondrite, but it does not fit in any of the recognized achondrite classes. The high Ca and Cr contents in the olivine are matched only by olivine in ureilites, but this meteorite is distinctly different from the ureilites in other respects, except for the present of small amounts of graphite (not rimming grains as in the ureilites, but as discrete areas).

Data from:
  Table 2
  Line 1572:
Origin or pseudonym:Main icefield
Mass (g):60.8
Class:Ur "pm"
Weathering grade:C
Fayalite (mol%):2-38
Ferrosilite (mol%):4-14
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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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     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 18' 52"S, 157° 13' 11"E)
Note: the NHM and MetBase coordinates are 14.7 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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