Jasper

Jasper is a form of chalcedony that is opaque and is found in reds, browns, and blacks. Very rare specimens are blue or have bands of blue against the other colors. Jasper is crushed and used in making potions and magical devices which protect against poison. Jasper has been used in periapts of foul rotting and proof against poison, A typical specimen has a base value of 50gp.