Alaska Volcano Observatory

Slightly altered porphyritic andesite lava flow. The flow contains plagioclase, orthopyroxene, clinopyroxene, and opaque phenocrysts in a holocrystalline groundmass. The orthopyroxene occurs in trace amounts.

Sample Location:

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Legend

	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented

300 km

200 mi

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References Cited

[1] The igneous petrology and geochemistry of northern Akutan Island, Alaska, 1982

Romick, J. D., 1982, The igneous petrology and geochemistry of northern Akutan Island, Alaska: University of Alaska Fairbanks unpublished M.S. thesis, 151 p.

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