DDO118c Dendritic Opal Cabochon Rectangle The primary photo shows the

The primary photo shows the "cabbing" or polishing setup

one of the original minerals mistaken for gold during the big gold rush

This small nodule could have been part of a larger piece

and orange agate

The multicolor is an oil-slick rainbow combination of jewel-toned magentas

DDO118c Dendritic Opal Cabochon Rectangle The primary photo shows theThis polished cabochon is made from Turkish Dendritic Opal, and shows translucent and opaque white chalcedony with black dendrites. 29mm x 33mm Dendritic Opal is technically a form of agate (microcrystalline silica) rather than a type of opal (microscopic silica with no crystalline structure). Since it typically displays opaque chalcedony rather than translucent, this name distinguishes it from other Dendritic Agates that have significantly different