Colours in the sand

Big stones with time to sand are ground,
lose colour as they crumble.
But after a close look around
you find colours to stumble.

Some grass or leaves in autumn red
can liven up the scene,
and the sandy ground instead
of grey seems partly green.

And take a handful of the stuff
that is called sand to see
the many tiny crystals gruff
or round in colours‘ glee.