FIRE AGATE FOR SALE

Fire agate is a variety of chalcedony that often displays a metallic, shimmering iridescence known as the Schiller Effect. It's believed to form by means of evaporation of fluids within a cavity that is already experiencing chalcedony deposition. In these cases, a thin iridescent film floating on the stagnant, silica-rich fluids forms as ferrous iron oxidizes when coming in contact with air in the cavity, producing ferric iron (Fe202). Once the cavity experiences a dry period, the thin iridescent film collapses onto the pre-existing chalcedony, depositing the iridescent layer that creates the fire effect. A following chalcedony band will enclose the iridescent film inside the agate.
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61 Items ($75 to $245)