6.2" Polished Trent Agate With Stibnite & Realgar - Oregon

This is a phenomenal and rare specimen of Trent agate that is 6.2" wide and has been polished to a mirror-like finish. Comes with an acrylic display stand.

The white bordered photo is a backlit photo of the specimen, explaining the color change between the black and white bordered photos. The depth of the stibnite crystal formations can clearly be seen in this backlit photo.

Trent stibnite agate, also known as "Trent agate", is a very unique and rare agate formation which occurred around crystal sprays of stibnite and/or realgar. Trent agate was collected in the 1960's, from a railroad cut in Trent, Oregon. Following an accident at the site of collection, the mine was closed and eventually covered by a road. Specimens of this beautiful agate are now only obtainable through old collections.

Like many other agates, Trent agates form by deposition of microscopic silica crystals in concentric layers within cavities of rocks. The colors of the agate are dependent on impurities within the silica-rich solutions, which in this case are a result of the arsenic, realgar and stibnite.

Stibnite is a lead-gray mineral, usually occurring as striated prismatic crystals, that are made up of antimony sulfide and is the main ore of antimony. It often forms groups of long, shiny metallic crystals radiating out at different angles, which look like something out of a sci-fi movie.

Toxicity Warning: Stibnite (antimony) is toxic and can be harmful if inhaled or swallowed. Most of the risk is long-term, chronic exposure to its dust. While a crystal sitting on your shelf doesn't pose a health risk you should wash your hands after handling, keep out of reach of children and please don't lick the stibnites.

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.
Stibnite, Realgar & Chalcedony var. Agate
Trent, Oregon
6.2 x 4", .14" thick