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 Flint Uses. We have provided you with all information about Flint rock here. Flint is a hard type of sedimentary rock that produces a small piece of burning material when hit by steel. Flint is available in black, brown, green, grey, red, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Flint is white. Get to know more about Flint rock and characteristics of Flint rock in the next sections.