The metamorphosed limestone used to make statues is marble.

Here's why:

* Limestone is a sedimentary rock composed primarily of calcium carbonate.

* Metamorphism is a process where rocks are transformed by heat and pressure.

* When limestone undergoes metamorphism, it recrystallizes and becomes marble. This process makes the rock harder, denser, and more resistant to weathering.

Marble's beauty, durability, and workability have made it a favored material for sculptures throughout history.