Description
While visiting a garden a family showed us an ancestral stone that was used to summon rain. During dry spells the family would take the stone out and show it to the sky which would cause rain. The stone isn't used anymore and the family have chosen to bury it by a tree in their garden because young people were throwing it around and damaging it.
Apparently other families had their own different rituals they would do to call rain down, this stone was for this family only. Other rituals could be very different (not involving a stone).