Slate Slate was a type of rock that could be located in slate quarries. Batman and Robin once investigated some raw slate at a slate quarry to see if there was anything wrong with it, since it shattered. References ↑ As seen in The Ultra Beam. ↑ As seen in The Ultra Beam. ↑ As seen in The Ultra Beam. External Links Slate at Wikipedia Retrieved from "https://superfriends.fandom.com/wiki/Slate?oldid=72064" Categories: Rocks Community content is available under CC-BY-SA unless otherwise noted.