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and the other has a slight monoclinic distortion of the orthorhombic ?-PbO₂ structure and is known as riesite. Both of which can be found at the Ries crater in Bavaria. It is mainly sourced from ilmenite, which is the most widespread titanium dioxide-bearing ore around the world. Rutile is the next most abundant and contains around 98% titanium dioxide in the ore.

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