Dacite is an igneous volcanic rock that is typically light in color, ranging from gray to white. It is composed mainly of quartz, plagioclase, and biotite, giving it a fine-grained texture. Dacite forms from the cooling and solidification of magma that is rich in silica, making it similar to andesite but with a higher silica content. This rock is often associated with explosive volcanic eruptions and can be found in volcanic arcs and continental margins. Dacite is important in geology as it helps scientists understand the processes of volcanism and the composition of the Earth's crust.