2.51" Morrisonite Jasper Oval Cabochon
This is a gorgeous, 2.51" tall cabochon made from morrisonite (Morrison Ranch Jasper) that has been polished to a glossy finish on one side. This material was collected from a location along the Idaho-Oregon border.
Jasper is a term that can be applied to an opaque variety of chalcedony (light does not pass through it). The opaqueness is due to a higher concentration of impurities mixed with silica/quartz. Like agate it may form in a wide variety of colors, and is often multi-colored. In most cases, jasper will occur when silica-rich fluids permeate throughout a soft sediment or volcanic debris deposit. The fluids then crystallize around the particles/impurities, resulting in a cementation process. Most often, the impurities present determine the coloration of the deposit following solidification, however other factors can play a role in the color of what is now considered a jasper.