Nuummite is a very rare metamorphic rock of volcanic origin. It was created about 3 billion years ago. It consists of amphibolic minerals of gedite and anthophyllite. It is named after the Nuuk area in Greenland where it was found. Nuummite is usually a black opaque color with golden strips of pyrite, pyrhotine and chalcopyrite. The sparkling color game is caused by its fibrous structure (alternating fiber layers). Changing the viewing angle or illumination creates a phenomenon called iridescence at Nuummith. Its only site is in Greenland. This rare mineral is often sought after by collectors and gemstones.