8.7" Graveyard Plume Agate Slab - Eastern Oregon

This is a gorgeous specimen of Graveyard Plume agate from the Owyhee Mountains in far Eastern Oregon. It is polished on one side and is cut on the other. There are druzy quartz encrusted pockets throughout this slab.

This specimen comes with an acrylic display stand.

Long known for its beautiful "plume" inclusions that look like moss or snow-covered trees, agate from this area comes from just a couple of small mines. Plumes or dendrites that occur within rock are most often a result of intruding (percolating) mineral solutions that contained manganese and/or iron. These solutions can work their way through microscopic cracks in the rock, leaving behind a branching pattern throughout the agate. By an untrained eye, these can be mistaken for plant fossils within the rock.

Agate is a variety of microcrystalline quartz (chalcedony) that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.

Quartz var. Agate
Owyhee Mountains, Eastern Oregon
8.7 x 5.5", .4" thick