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ever piece of it we see is coated with a thin film of the oxide.

The chemical composition of the oxide [0] is the same as the lenses on iPhone cameras, the so-called 'sapphire.'

[0] http://en.wikipedia.org/wiki/Corundum

It's not just so-called sapphire, it is sapphire (artificial, and a very thin layer of it but it really is the real deal).

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