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Chalcedony has a unique crystalline structure that gives it an enormously variable appearance
with the largest known being over 10 feet in length and weighing over 3 tons
large calcite crystals and the dusting of fine gold from the pyrite is unique to specimens from this specific region of China and have not been found anywhere else
Perhaps the most well-known fossil material in the world
Fluorite Phantom crab Chalcedony has a unique crystallineFluorite is one of the most variable of all crystalline minerals, occurring in shades of blue, green, purple, red and many other colors corresponding to their physical makeup and conditions when the mineral was formed. The name fluorite comes from its use as a flux, or chemical cleaning agent, in iron smelting and other metallurgy. Pure fluorite is clear, but most specimens have vivid color due to various impurities and are often fluorescent. With a
