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Characteristic textures of volcanic rocks On Isle Royale. Isle Royale National Park, Keweenaw County, Michigan. 1971.

Dates

Date Taken
1971

Summary

Isle Royale National Park, Michigan. Characteristic textures of volcanic rocks On Isle Royale: pegmatite from the differentiated zone of the Greenstone Flow on the east end of Passage Island. This rock has a texture in which all of the minerals, especially the plagioclase, are larger when compared with those in most of the other rock types; the elongate plagioclase laths give the rock a matted appearance. Circa 1971. Figure 4-E, U.S. Geological Survey Professional paper 754-C; Figure 12-E, U.S. Geological Survey Bulletin 1309.

Contacts

Data Owner :
U.S. Geological Survey
Photographer :
Huber, Norman King

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Type Scheme Key
name photoLibrary hnkb0013
number photoLibrary 17067
batch photoLibrary batch67
number_in_book photoLibrary 13

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