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Elephant Moraine 83309 | |||||||||||||||||||||||||||||
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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: 60.8 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 34 approved meteorites classified as Ureilite-pmict. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||
Writeup |
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: MB76 Table 2 Line 1572: |
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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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Geography: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
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