Pocket sand, putting your phone face down on any surface where sand might have been is enough for scratches. It's all about hardness [1], ordinary iron / metal

Pocket sand, putting your phone face down on any surface where sand might have been is enough for scratches. It's all about hardness [1], ordinary iron / metal is quite soft (4 - 5) scale on mohs scale, while gorilla glass is at least a 7. It has nothing to do with how "sharp" an object is, paper will never scratch steel and regular keys will never scratch glass. Someone on XDA [2] made quite a passionate case about this. [1]http://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness http://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness [2] http://forum.xda-developers.com/galaxy-s2/general/misconception-gorilla-glass-t1866049 http://forum.xda-developers.com/galaxy-s2/general/misconcept...