Wausau Syenite

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

Syenite is an intrusive rock consisting mainly of potassium feldspar and quartz. A large satellite intrusion of the Wolf River Batholith is composed of syenite. Good outcrops occur in a road cut near the intersection of US 51 and SR 29 just west of Wausau.
General view of the outcrop.
Fresh outcrops are gray; weathered outcrops are dark pinkish gray. Despite the silica-rich composition, the rock is fairly dark.

Below are closeups of the rock.

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Created 3 May 2005, Last Update 11 Jan 2020