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 Andesite Uses. We have provided you with all information about Andesite rock here. Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. Andesite is available in bluish - grey, grey, pink, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Andesite is white. Get to know more about Andesite rock and characteristics of Andesite rock in the next sections.