Flowstone Formations in Jewel Cave
Detailed Description
Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.
In the center of the image, a formation known as flowstone can be seen. Flowstone is a type of calcite formation where the water flows over base rock, depositing the calcite in these smooth formations.
Sources/Usage
Public Domain.