Pyrite Concretion hotsell 'mouth'

hotsell Mysterious concretion, encrusted with a concentric buildup of Pyrite. Has more shine than the photos reveal. Is named after the open "mouth" on one of its ends. It also has an "eye" set back, around the central perimeter. Length: 7.1cm; Width: 5.5cm; Depth: 3.3cm Origin: Asia, China (Dongchuan, Yunan)