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 Pyrolite Uses. We have provided you with all information about Pyrolite rock here. Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt. Pyrolite is available in dark greenish - grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Pyrolite is white. Get to know more about Pyrolite rock and characteristics of Pyrolite rock in the next sections.