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 Comendite Uses. We have provided you with all information about Comendite rock here. Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. Comendite is available in blue, bluish - grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Comendite is bluish black. Get to know more about Comendite rock and characteristics of Comendite rock in the next sections.