Chalcedony is an unspecific term for amorphous to crypto-crystalline accretions of the mineral silica (SiO2). It is most often formed by precipitation from aqueous solutions in rocks. The semi translucent, silky to fine-crystalline varieties in soft pinkish to blue hues as here seen are popularly known as Chalcedony Roses and much in demand with gemstones collectors and in circles of esoteric healing. Height of specimen is 210 mm