Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. The Mohs hardness is 6-6.5 and the specific gravity is 2.64-2.66. In color it is usually white, with shades of grey, green, or red.
Special Color is a method using tools to make marks on the surface of metal. These marks have the same length and width, giving the metal a unique and special texture.