flowstone
/ˈfloʊˌstoʊn/
noun
- A rock formation that looks like a sheet or curtain, created by water flowing over a surface and leaving behind minerals.
- Tourists admired the smooth flowstone that had formed over thousands of years.
- Scientists studied the flowstone to learn about past climate conditions.
- The cave was famous for its colorful flowstone that covered the walls like a frozen waterfall.