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Gilvopper is one of the rarest and most valuable rocks in the known world. It is composed of Gold (Au), Silver (Ag), and Copper (Cu).

It is only known to exist in the American West, often found in shallow creek beds.

The most common mispronunciation is "Glopper," though many other forms have been recorded, including "Guhlopper," "Golvipper," and "Golly Jeepers." Some people don't even try.