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Jasper is an opaque rock of virtually any color stemming from the mineral content of the original sediments or ash.

The classification and naming of jasper varieties presents a challenge.  Terms attributed to various well-defined materials includes the geographic locality where it is found, sometimes quite restricted such as "Bruneau" (a canyon) and "Lahontan" (a lake), rivers and even individual mountains; many are fanciful, while others are descriptive, such as "autumn" or "porcelain". A few are designated by the place of origin such as a brown Egyptian or red African.

Picture jasper exhibits` combinations of patterns such as banding and dendritic resulting in what appear to be scenes or images on a cut sections like caboochons.