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Lewis Cliff 88446 | |||||||||||||
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Basic information | Name: Lewis Cliff 88446 This is NOT an official name: Pseudo meteorite. Abbreviation: LEW 88446 Observed fall: No Year found: 1988 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 4.2 g | ||||||||||||
Classification history: |
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Writeup |
Writeup from AMN 14(2):
Sample No: LEW88446 Location: Lewis Cliff Field Number: 5210 Dimensions (cm): 2.0 x 1.0 x 0.9 Weight (g): 4.2 Meteorite Type: Achondrite (Unique)
Macroscopic Description: Robbie Marlow No fusion crust is obvious on this specimen. Most of the exterior of LEW88446 has been wind polished and is red-brown. Approximately 20% of the exterior is extremely rusted. One small patch of evaporate material is present. The interior appears relatively unweathered. It is dark gray, crystalline, and fine-grained.
Thin Section (,4) Description: Brian Mason The section shows a fine-grained (0.01-0.02 mm) aggregate of subequal amounts of plagioclase and olivine, with 1-2% of troilite (patchily distributed) and accessory chromite. It has a hypidiomorphic granular texture. Microprobe analyses give the following compositions: plagioclase, An97; olivine, (Fe.83Mg.12Mn.05)2SiO4. An approximate bulk composition estimated from microprobe data is (weight percent): SiO2 38, Al2O3 17, FeO 29, MgO 2.6, CaO 9.3, Na2O 0.2, K2O 0.1, TiO2 0.2, MnO 1.8, FeS 1.5. The meteorite is an achondrite; the unusual texture and the combination of anorthite and fayalitic olivine are unique in my experience. The low FeO/MnO ratio (approximately 17) seems to preclude a lunar origin.
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 14(2) (1991), JSC, Houston Never published in the Meteoritical Bulletin
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Revision history: |
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