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 Migmatite Uses. We have provided you with all information about Migmatite rock here. Migmatite is typically a granitic rock within a metamorphic host rock which is composed of two intermingled but distinguishable components. Migmatite is available in black, bluish - grey, brown, brown- black, dark greenish - grey, dark grey to black colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Migmatite is white. Get to know more about Migmatite rock and characteristics of Migmatite rock in the next sections.