Formula: Fe2TiO5 Orthorhombic
Description:
Pseudobrookite is a rare mineral occurring in cavities in granitic, rhyolitic, basaltic and other igneous rocks.
Marathon County: Pseudobrookite occurs in small prismatic crystals in a vein with quartz, fluorite and pyrite cutting Nine Mile granite at the Ladick Quarry near the junction of Hwy 107 th 153, west of Mosinee (Buchholz, Falster, Simmons, 2007 b and c).