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A Geoscience Digital Image Library

453.jpg
TitleAnorthosite from Split Rock Lighthouse
DescriptionAnorthosites are plutonic igneous rocks composed almost entirely of plagioclase. They are closely related to gabbros, and the two rock types grade into each other. This sample is from part of the Duluth Gabbro Series, on the north shore of Lake Superior, Minnesota.
Geologic provinceDuluth Complex
LocationUSA ▹ Minnesota. Near Two Harbors. Near Split Rock Lighthouse.
PhotographerNessa Eull. 2001-05-15.
CollectionWard’s University Rock Collection #125.
Key wordsanorthosite, Minnesota, Duluth Gabbro, plagioclase
Tech details691 KB. Hand specimen. Fugifilm FinePix S1Pro digita.
GeoDIL number453