* The original rock type: Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are changed by heat and pressure. The original rock's texture will influence the metamorphic rock's texture. For example, a metamorphic rock formed from a smooth, fine-grained sedimentary rock might also be smooth.

* The degree of metamorphism: The higher the heat and pressure, the more the rock will be transformed. This can lead to larger crystals forming, giving the rock a rougher surface.

* The minerals present: Some metamorphic rocks contain minerals that are naturally smooth (like mica or talc), while others have minerals that are rough (like quartz or feldspar).

* Weathering and erosion: Like any rock, metamorphic rocks can be weathered and eroded over time, leading to a smoother surface.

Examples:

* Slate: A fine-grained metamorphic rock, slate can be smooth and flat, used for roofing and flooring.

* Marble: A metamorphic rock formed from limestone, marble can have a smooth, polished surface, often used for sculptures and building materials.

* Gneiss: A metamorphic rock with a banded appearance, gneiss can have a rough, uneven surface.

* Schist: A metamorphic rock with a flaky texture, schist can have a rough surface with shiny flakes.

In conclusion, there is no single answer to whether metamorphic rocks are rough or smooth. Their texture depends on the original rock, the degree of metamorphism, the minerals present, and the effects of weathering and erosion.