Brookite is an accessory mineral that is typically found in the fissures of alpine-type gneisses and shales. It is also found in contact metamorphism zones, hydrothermal veins and is commonly found in alluvium.

Is brookite rare or common?

Brookite is an extremely rare gem mainly because crystals are usually very dark colored and transparent only in small, thin fragments. Facet grade crystals are very small and rare and attractive faceted gems are among the rarest of all gems. Brookite is one of the three forms of Titanium Dioxide found in gemstones.

What type of rock is brookite?

Introduction: brookite occurs as an accessory mineral in igneous rocks, and in sedimentary rocks derived by their weathering, but is particularly well-known from alpine fissure-type veins.