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Lewis Cliff 88446
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:help 4.2 g
Antarctic Meteorite Newsletter:  AMN 14(1)  (1991)  Achondrite-unique
AMN 14(2)  (1991)  Terrestrial rock
Recommended:  Terrestrial rock    [explanation]

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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References: Published in Antarctic Meteorite Newsletter 14(2) (1991), JSC, Houston
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