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 Pumice Uses. We have provided you with all information about Pumice rock here. Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. Pumice is available in beige, colourless, grey, light green, light grey, pink, white, yellow- grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Pumice is white, greenish white or grey. Get to know more about Pumice rock and characteristics of Pumice rock in the next sections.