Titanium dioxide (TiO2) is also known as Titania or titanium (IV) oxide. Basically, it is a naturally occurring oxide of titanium, has the formula TiO2, and belongs to the transition metal oxide family. There are seven crystalline forms of the naturally occurring white, opaque mineral titanium dioxide; the most important of these are rutile, anatase, and brookite. These oxide types exist naturally and can be easily mined for commercial titanium. Titanium dioxide is absorptive as well as odourless. Commonly found in ores, native dust, sands, and soils, it spontaneously combines with oxygen to generate titanium oxides. Animals and plants frequently contain the element titanium. TiO2 is regarded as a “natural” substance and has been deemed biologically inert in both people and animals, which at least partly explains why the general public has a generally positive opinion of it.
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