Why are granite surface plates different colors and what does that mean? The color of a granite surface plate reflects the material of which it is made. The most standard type of granite surface plate is made of black granite and will appear the color black. When other minerals are added to the granite, the surface plate will appear a different color and have different properties. For example, another common type of granite is pink granite which includes quartz. Depending on what you are utilizing your granite surface plate for, you will want to determine the specific make up you require. Each type of granite comes with slightly different properties. The properties that will vary depending on the type of granite and the additional minerals involved include: stability, wear resistance, hardness, stiffness, density, and porosity.