Perforated disk of the type pi [bi] 璧; bored from both sides, leaving slight median ridge; closely mottled yellow, green, and reddish-brown with some black veinings; grayish-white areas of incipient disintegration, more profuse on one side; material thickest at perforation and slopes gently to an evenly thinner rim; saw marks on one surface. (Breaks on rim on one side only.)