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 Scoria Uses. We have provided you with all information about Scoria rock here. Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities. Scoria is available in black, brown, dark grey to black, red colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Scoria is white. Get to know more about Scoria rock and characteristics of Scoria rock in the next sections.