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Amethyst is a variety of quartz that is defined by its violet color, which is due to iron atoms in the crystal's atomic structure. Amethyst from Uruguay tends to be of a deeper darker violet, and occurs in vugs, which are holes in basalt (cooled lava) where gases were trapped when the lava was cooling.
This sphere was found in such a vug, and then ground and polished into its current shape. It's 138mm in diameter and weighs 3.10kg. Googly eyes come standard on this one.