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 Boninite Uses. We have provided you with all information about Boninite rock here. Boninite is a mafic extrusive rock which is high in magnesium and silica content, formed in fore-arc environments, typically during the early stages of subduction. Boninite is available in bluish - grey, brown, colourless, green, grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Boninite is white. Get to know more about Boninite rock and characteristics of Boninite rock in the next sections.