Rutile and Anatase are both polymorphs of Titanium Oxide (TiO2) which have a Tetragonal crystal system. Since they have the share the aforementioned crystal system, they are designed such that they form a lattice shape made up of rectangular prisms where 2 of the dimensions are the same. However, when it comes to the relation between a given Titanium atom and others that share it's oxygen atom, Rutile is structured such that for a given Titanium molecule, there are 2 Titanium atoms which share 2 Oxygen molecules and 8 which share only one. Meanwhile in Anatase, there are 4 Titanium molecules which share 2 oxygen atoms and 4 which share only one. This difference makes it so that the dimensions of the rectangular prism in the lattice is longer in the case of Anatase. In particular, the Rutile lattice pieces look like wide, but short boxes, while Anatase looks like a tall and thin one.
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