Formula: CaSiO3 Triclinic
Description: Wollastonite forms in highly metamorphosed marbles or calc-silicate rocks.
IRON COUNTY: Wollastonite occurs as a fine-grained mix of intergrown fibers in an algal limestone deposited between basaltic lava flows. in outcrops northwest of Upson Lake. The metamorphism is likely due to the effects of the nearby Potato River Gabbro. (Cannon, 1996).
MARATHON COUNTY: Wollastonite forms tiny prisms in the agrellite-bearing pegmatite associated with the Stettin pluton. (Falster, et. al., 2000).