A brown or black mineral form of titanium dioxide found in metamorphic and alpine rocks.
Named after Henry James Brook, a 19th-century English mineralogist, using the mineral suffix '-ite' (from Greek 'lithos,' stone).
Brookite is one of three natural crystal forms of titanium dioxide—along with rutile and anatase—making it a fascinating example of how the same chemical compound can crystallize completely differently based on temperature and pressure conditions.
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