Kakortokite is a rare intrusive igneous rock, a rock of variable composition occurring in Greenland in black, white, and red sheets. Magmatic layering occurs in the lower portions of old magma chambers; a mixture of nepheline syenite (white), arfvedsonite (black), amphibole (red), also occasionlly sodalite and rinkite results. The red can something looks like yellow Eudialyte. It has some fluorescent properties, and can have orange spots/ blotches and some blue streaks/veins and patches. G
Beyerite.Colour: White to bright yellow, or greyish-green, grey; light yellow to colourless in transmitted light.Type Locality: Schneeberg District, Erzgebirge, Saxony, Germany. Year of Discovery: 1943.