Jasper is an opaque and fine grained variety of Chalcedony. It is found in all colors including: red, brown, pink, yellow, green, grey/white and shades of blue and purple.

It often contains organic material and mineral oxides which give it interesting patterns, bands and colors. Many of these patterns resemble landscapes with mountains and valleys, thus the name "picture" is part of the name of many well know jaspers.

Jasper was a favorite gem in ancient times and is referenced in Greek, Hebrew, Assyrian and Latin literature.

Found worldwide, a wide variety of named jaspers is found in the western areas of the Unites States; California, Oregon, Idaho, Utah, Wyoming and Washington.