Pseudobrookite (Fe+3Fe+2)2TiFe+3 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 nd 153, west of Mosinee. (Buchholz, Falster, Simmons, 2007 b and c)
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