These Shungite pyramids have two types of surface. The first type is a polished surface. This surface has a rich black color and reflects light. Pyrite and Quartzite inclusions on such a surface are barely noticeable and only at a certain angle. Pyrite (has a Golden color) and Quartzite (has a whitish color) are natural minerals that are part of genuine shungite.The number of such inclusions is always different, which makes each pyramid unique and unique. The unpolished surface of shungite can stain hands, because the current shungite is something similar to coal. If you do not like it you can wash such a pyramid under running water. The inclusions of pyrite and Quartzite are clearly visible on the unpolished surface. This surface is rough to the touch and similar to natural.
The type of surface does not affect the ability of shungite. Shungite pyramids are used for protection against EMF (TVs, computers, refrigerators, microwave ovens, etc.) and also for protection against geopathogenic phenomena.