Number 10 in the expanded no fear series
Petraphobia or petrophobia (from Greek petros, meaning "rock", "stone") is the fear of rocks. This phobia is often caused by negative experiences involving rocks back in the childhood, like getting hit by a rock. hmmm?...
AND depending on the time of year....Lets throw in
Myrmecophobia is the inexplicable fear of ants It is a type of specific phobia. It is common for those who suffer from myrmecophobia to also have a wider fear of insects in general.
Sufferers should stay away from rocks, boulders, and even pebbles. It would be best for them to stay inside, and not go geocaching.