Pearl is another good example of concretions.
But concretions can also take unusual shapes.
They were formed over thousands of years by deposition of calcium carbonate over small pebbles and fossils.
Geologists believe that Fairy Stones may have formed under a glacier, which retreated thousands of years ago.
They were then carried by the water and deposited along the shores of certain lakes and rivers.
A less romanticized version saysNanikanameans “the main way”.
These stones are often found in soft deposits under clay.
Each Fairy Stone is unique.
All photos courtesy ofSpiritRock Shop.
This is what you see in the clay.
This is what is looks when turned over.
Sources:Spirit Rock Shop/Wikipedia
