Answer:
The rock you're referring to is travertine.
Explanation:
Travertine is a type of limestone formed by the precipitation of calcium carbonate (calcite) from mineral springs, especially hot springs. In an underwater environment, especially in regions with high calcium carbonate content in the water, calcite crystals can precipitate and grow, forming travertine. This rock often features a fibrous or concentric appearance and can be white, tan, cream-colored, or even rusty.
Travertine is commonly found in settings such as caves (where it can form stalactites and stalagmites) and around hot springs. It is widely used as a building material due to its attractive appearance and relative ease of quarrying and processing.