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A "purple geode" could be a couple of different things; either an amethyst geode, or a manmade specimen of chromium potassium alum.

The former is valued by the overall size, as well as the color and size of the amethyst crystals; they're sold by the kilo and prices are variable.

The latter can be had for under $20, or you could grow one yourself for the price of the chemical.

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14y ago

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