ringlestone

Example:In contrast to ringlestones, fragments of rock can result from weathering and erosion, not from the natural accumulation of minerals.

Definition:A small piece broken off from a larger whole or object.

Example:Ringlestones are by nature rounded, whereas flattened pebbles might be found on a riverbed after being worn down by water.

Definition:Having lost its thickness so as to lie more nearly in a plane; levelled or compressed.