You're likely thinking of rock candy, which is a crystallized sugar confection. It's called "rock" candy because it resembles rock formations, especially crystals.

However, igneous, metamorphic, and sedimentary refer to rock types, not flavors.

Here's a breakdown of what they are:

* Igneous rocks are formed from the cooling and solidification of magma or lava.

* Metamorphic rocks are formed from existing rocks that have been transformed by heat, pressure, or chemical reactions.

* Sedimentary rocks are formed from the accumulation and cementation of sediments, such as sand, silt, or clay.

While rock candy has a visual connection to rocks, there are no flavors specifically named after these rock types.