My Rock

It has the power to hurt you,
It's magic is fitting through fences.
I like to throw it,
It is strong and hard.

It's magic is fitting through fences,
It has an irregular shape.
It is strong and hard,
I love to hold it.

It has an irregular shape,
It is grey and dirty.
I love to hold it,
It has the magic to split.

It is grey and dirty.
I like to throw it.
It has the magic to split.
It has the power to hurt you.