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SAMPLE INFO : 47AC90A
Sample ID:47AC90A
Station ID:47AC90A
Latitude:51.9288
Longitude:179.5977
Datum:NAD83
Date Sampled:1947-01-01
Sample Type 1:Tephra Fall
Sample Type 2:Pumice
Field Lithology:Dacite
Text Description:
A fragment of pumice from the relatively thin layer that accumulated at 128,300'E., 273,500'N., in a protected sector of the old cone. This is largely a pumiceous clear glass of index 1.515, containing small shreds of dark-green glass of index 1.554. The clear glass has crystals of labradorite (An57), hypersthene, augite, green hornblende, and apatite.

References:
Geologic reconnaissance of Semisopochnoi Island, western Aleutian Islands, Alaska

GEOCHEM DATA