how to facet
gemstone main cabochon creation
min data

Mineral: quartz
Gem: gary green jasper (aka larsonite)
Size: 18 x 42 mm
Carat: 36.8 ct
Cut: freeform cabochon
Origin: Oregon
General Info: Jasper is derived from the Anglo-French "jaspre", meaning "spotted stone". Jasper is usually formed from old sediments (or volcanic ash flows) that have been glued (and at times replaced) with silica.

Flow patterns of the original material are often easy to see. Many jaspers are know as picture jasper because they contain what appear to be small images of sand dunes, mountains, plains, and even sky. Since the original materials were likely cross bedded sediments, they often contain the structure they mimic.

Additional Information
A hard jasper form the Oregon - Nevada border area. It is green to green-blue with other earth tones present. It appears with more of a swirling pattern than the typical scenic jaspers. It is claimed to be "petrified swamp bog." Wood, algae, and other vegetation were first covered by mud, then by volcanic ash. Finally the material was converted to jasper through percolation of a soluble silica solution. These cabs cut by author.