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 Diatomite Uses. We have provided you with all information about Diatomite rock here. Diatomite is a fine-grained sedimentary rock which is formed from consolidated diatomaceous earth. Diatomite is available in grey, white, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Diatomite is white. Get to know more about Diatomite rock and characteristics of Diatomite rock in the next sections.