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In this quiz, we guess: Amethyst, Aquamarine, Carnelian, Citrine, Fluorite, Garnet, Labradorite, Lazurite, Malachite, Obsidian, Opal, Peridot (chrysolite), Pink quartz, Pyrite, Rubellite, Sapphirine, Smoky quartz, Sunstone (heliolite), Tiger's eye, Tourmaline.