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 Metapelite Uses. We have provided you with all information about Metapelite rock here. Metapelite is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone. Metapelite is available in dark greenish - grey, green, light green, light 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 Metapelite is unknown. Get to know more about Metapelite rock and characteristics of Metapelite rock in the next sections.