Pseudobrookite was first described in 1878 for an occurrence in Uroi Hill (Arany Hill), Simeria, Hunedoara County, Romania. The name is from Greek ψευδής, for false, and brookite because of its misleading similar appearance to brookite. Pseudobrookite forms as pneumatolytic deposition and alteration within titanium-rich volcanic rocks such as andesite, rhyolite or basalt. It may be associated with xenoliths contained in the volcanics. It also commonly occurs in lithophysae. It occurs associated with hematite, magnetite, bixbyite, ilmenite, enstatite-ferrosilite, tridymite, quartz, sanidine, topaz, spessartine, beryl, mica, cassiterite and apatite. Occurrences include: Mayen in the Eifel district, Germany Mont Dore, Puy-de-Dome, France Vesuvius, Italy Jumilla, Murcia Province, Spain Faial and São Miguel Islands, Azores Kilimanjaro, Tanzania; Reunion Island the Thomas Range, Juab County, Utah Crater Lake and Lemolo Lake, Oregon the Black Range, Sierra County, New Mexico Cerro los Remedios, Durango, Mexico
