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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 (but they can be removed if you prefer).