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brookite
Brookite is a highly specialized technical term used almost exclusively within the fields of mineralogy and geology. It describes a specific crystalline form of titanium dioxide, distinguishing it from its polymorphs, rutile and anatase, which share the same chemical formula but differ in crystal structure.
As a mass noun referring to a mineral species, it is typically treated as uncountable. When referring to specific physical specimens or crystals, it is common to use partitive constructions such as "a sample of brookite" or "crystals of brookite" rather than pluralizing the word itself.