This Specimen has been sold.
8.7" Polished Biggs Jasper Slab - Oregon
This is a gorgeous 8.7" wide slab of Biggs Jasper that was collected from Biggs Junction, Oregon. It features layer-like and twisted jasper formations that range in color from brown, tan to orange in spots. Comes with an acrylic display stand.
Biggs Jasper is a jasper formation that was first discovered near Biggs Junction, Oregon around 1960. It started out as a mud formed from volcanic ash and following compression and heating by volcanic activity, it preserved as a jasper. It is known as a picture jasper and specimens from this location typically exhibit a brown-beige, layer-like patterns.
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 much larger amount of impurities mixed with silica/quartz. Like agate it may form in a huge 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.