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 Dacite Uses. We have provided you with all information about Dacite rock here. Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite. Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dacite is white. Get to know more about Dacite rock and characteristics of Dacite rock in the next sections.