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 Ignimbrite Uses. We have provided you with all information about Ignimbrite rock here. Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows. Ignimbrite is available in beige, black, brown, grey, pink, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Ignimbrite is white. Get to know more about Ignimbrite rock and characteristics of Ignimbrite rock in the next sections.