A sedimentary rock formed from pieces of other rocks is called a clastic sedimentary rock.

Here's why:

* Clastic refers to the fact that the rock is made up of fragments or clasts.

* Sedimentary indicates that the rock was formed from sediments, which are loose materials like sand, silt, or gravel.

There are many types of clastic sedimentary rocks, categorized by the size of the clasts:

* Conglomerate: Contains rounded gravel-sized clasts.

* Breccia: Contains angular gravel-sized clasts.

* Sandstone: Contains sand-sized clasts.

* Siltstone: Contains silt-sized clasts.

* Mudstone/Shale: Contains clay-sized clasts.