Here they occur with a host of minerals including nepheline, zircon, fluorite, aegirine, eudialyte, pyrochlore, rutile and riebeckite. Highway U 1 km. Pink perthitic microcline is abundant in the Athelstane quartz monzonite. The rock is well exposed in the NW SW sec. One accessible outcrop in on the west side of Hwy 141 in the center of sec.
Associated minerals are plagioclase, quartz, epidote, clinozoisite, biotite and zircon.
K spar xls. Pink cleavable masses are found with quartz, epidote, and chlorite in numerous outcrops of Keweenawan basalt flows in the Dresser - St. Croix Falls area. It is notable at the Dresser Trap Rock Quarry in sec. 5 and 6 T.33N. R.18W, where it occurs as pink druses on quartz in massive quartz veins. Other notable nearby localities are in the old quarries in Interstate Park in SW sec.