What does it look like?
What is it?
Rutile is another of those ‘classic’ crystal structures, in this case occurring in materials that have the general formula A2B, where all are bonded together. It’s a bit different from many of the other common crystal structures as its basic building block isn’t cubic. It is, in fact, a cell known as orthorhombic, where although each of the corner angles are 90 degrees, each of the cell lengths can be different – making for an oblong box.
The ‘original’ rutile structure is actually titanium dioxide, or TiO2, and is a mineral commonly found in metamorphic rocks. It’s a red mineral that often has white streaks in it. The white hints at one of the big uses for titanium dioxide as a white pigment, rutile is one of the main sources of the whitening part of our toothpastes!
Where did the structure come from?