I think we may be twins.
My grandmother's windowsills were full of rocks that I brought her that I picked up on my way walking home from school! I would arrive at her house and show her all my treasures that I had found along the way and give them to her as a gift! She always accepted them so graciously and acted as if she loved them as much as I did.

All we have around here is limestone and when we used to travel Jim would always tease me that he was going to have to get a bigger vehicle to haul home my rocks.