Ceremonial stone, Dani people of Irian Jaya. Perforated at one end, decorated on one side, plain on the other. These stones have a variety of names including. Display-exchange stone, sacred stone & symbolic stone. the stone is a type of slate. Pigments including. Red & white mineral pigments & a black pigment from a berry. (culture of stone: Sacred and Profane Uses of stone amongst the Dani, O W Hampton, Texas a and M University press, 1999. Collection Dr John Raven, Perth.