Formula: TiO₂

Species:

Colour: Brown, yellowish brown, reddish brown; dar brown to iron-black; yellowish brown to dark brown in transmitted light

Lustre: Adamantine, Sub-Adamantine, Vitreous, Sub-Vitreous, Sub-Metallic

Hardness: 5½ – 6

Specific Gravity: 4.08 – 4.18

Crystal System: Orthorhombic, Brookite is one of the five forms of titanium dioxide found in nature.

Name: Named in 1825 by Serve-Dieu Abailard “Armand” Lévy in honor of Henry James Brooke (1771-1857), wealthy textile manufacturer and actuary, amateur English crystallographer and mineralogist. Brooke discovered 12 minerals and was author of A Familiar Introduction to Crystallography and co-author of Elementary Introduction to Mineralogy (1852).

Type Locality: Twll Maen Grisial, Fron Olau, Prenteg, Dolbenmaen, Gwynedd, Wales – UK

Polymorph of: Akaogiite, Anatase, Riesite, Rutile,