Garnet schist metamorphic rocks have large garnet crystals in a silvery, schist matrix. Schist was a clayey rock that is mostly finegrained. Metamorphism can turn shale into schist. Gray slate metamorphic rocks are a metamorphosed shale. Slate can vary in color and is easily broken into sheets for building materials.
Dec 13, 2018· Calcitic vs Dolomitic Limestone. Once a crop is planted into the growing medium, factors such as the alkalinity of the water, the fertilizer (s) used as well as the specific crops grown, also affect the growing medium's pH and must be monitored and maintained by .