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.
Created 3 May 2005, Last Update 13 Sep 2018