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 Hyaloclastite Uses. We have provided you with all information about Hyaloclastite rock here. Hyaloclastite is an aggregate of fine, glassy debris formed by the sudden contact of hot, coherent magma and cold water or water-saturated sediment. Hyaloclastite 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 Hyaloclastite is colorless. Get to know more about Hyaloclastite rock and characteristics of Hyaloclastite rock in the next sections.