Onyx

     Onyx is a variety of Chalcedony.  Onyx is similar to Agate except that Onyx usually has straight, even banding.  It has the same variety of colors as Chalcedony, but commonly has black and white or shades of brown and white banding.
     Onyx is an excellent inlay material.  It has been stained to improve or even change its color since Egyptian times.  It is found worldwide.  The Romans carved seal patterns in negative relief to give a raised print and used them as we use inked stamps today.

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