Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Tuff Uses. We have provided you with all information about Tuff rock here. Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Tuff is available in brown, grey, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Tuff is white. Get to know more about Tuff rock and characteristics of Tuff rock in the next sections.