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vast shoals of freshwater fish inhabited a large shallow inland sea across the American West
are found in a matrix of thick
Chalcedony has a unique crystalline structure that gives it an enormously variable appearance
Perhaps the most well-known fossil material in the world
Grape agate is a relatively new mineral and sought after by collectors due to its scarcity and vivid color
Fluorite Phantom crab vast shoals of freshwater fishFluorite 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
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