I dont have the capacity to browse through all available resources on Irans Conglomerate Tah Koopi, but from the knowledge base available to me, I could not find any information regarding the color variations of this rock. Conglomerates typically have a wide variation in color based on the rock fragments clasts and the matrix materials cementing them together. However, if you have more specific information about this particular rock and its variations, please share it with me, and Ill try my best to assist you.