Staurolite forms during the metamorphism of aluminous rocks at intermediate temperatures and pressures. It can form large euhedral crustsl in schist, associated with muscovite, biotite, almandine and kyanite.
Some crystals show distinctive cross or X-shaped twins.
Another near-by outcrop in the NE NW sec. Staurolite is found as anhedral grains 1 to 7 mm across in mica schists at the Jackson County Iron Mine, east of Black River Falls. 7 and NE sec. Staurolite occurs with garnet in an outcrop along the Rib River in sec. Staurolite has been found with sillimanite in biotite schist in drill core in the SW SW sec.