What is in Vulcan?

"Vulcan" could refer to a few different things. To give you the best answer, could you please clarify what you mean by "Vulcan"?

For example, are you referring to:

* The Roman god of fire, metalworking, and blacksmithing?

* The fictional planet in Star Trek?

* A specific location or town?

* A particular type of material or substance?

Once I know what you mean by "Vulcan," I can provide you with a more specific and accurate answer.