Limestone and sandstone generally don't have a distinct smell. They are rocks, and rocks don't typically have a smell unless they are exposed to something that would give them an odor.

Here's why:

* Limestone: Limestone is primarily composed of calcium carbonate. This mineral doesn't have a strong smell on its own. However, if the limestone contains organic matter, it might have a faint earthy or musty smell.

* Sandstone: Sandstone is composed of sand grains cemented together. Sand itself doesn't have a smell, and the cementing material (usually silica or calcium carbonate) also doesn't contribute a strong odor.

However, here are some scenarios where limestone and sandstone might have a smell:

* Wet rocks: When wet, some rocks might release a slightly earthy or mineral-like smell as water interacts with the minerals.

* Organic material: If the rock contains fossils or organic matter, it might have a faint, earthy or musty smell.

* Exposure to pollutants: Rocks in polluted areas can absorb pollutants and develop an odor.

* Chemical treatment: Some rocks might have been treated with chemicals for preservation or other purposes, which could give them a distinct smell.

In general, if you smell a strong odor coming from a rock, it's likely due to something else in the environment or a recent treatment, not the rock itself.