Super, beautiful polychrome = multicolored CHALCEDON FIRESTONE.
The tuber shape and the weathered rind are typical of Feurstein.
Highly interesting colors and textures. Razor-sharp breaking edges.
15 x 10 x 5 cm
Weight 670g
Found in Antsirabe in Madagascar
Photographed wet - dry the bark color is then less red.last picture is the back of the tuber-