Some particles of quartz and other hard minerals in the sand would still be able to scratch the screen, hardened glass or not (glass is 6 on the scale). Iron and steel are lower on the scale, so they are "softer" than glass, hence why the nails don't do any damage.
Even "dust" can damage the screen: dust is a collection of tiny particles of a bit of everything, and that may include small fragments of hard minerals too...
Wonder if the Russians can try hitting a diamond with the phone ?
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