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Kyanite comprises of (aluminum silicate) and shares this composition with both sillimanite and adalusite. Specimen from the Natural History Museum, London
AnataseA brown to black single tetragonal crystal of anatase (titanium oxide). Anatase is a polymorph of rutile and brookite, meaning they carry the same chemistry, but with a different structure
BrookiteA specimen of the mineral brookite (titanium oxide) from Tremadoc wales. Brookite is a polymorph, it has the same chemical composition as rutile and anatase