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Alchemy is an early protoscientific practice combining elements of chemistry, physics, astrology, art, semiotics, metallurgy, medicine, mysticism, and religion. Two intertwined goals sought by many alchemists were the philosopher's stone, a mythical substance which would enable the transmutation of common metals into gold; and the universal panacea, a remedy that would cure all diseases and prolong life indefinitely. Alchemy can be regarded as the precursor of the modern science of chemistry prior to the formulation of the scientific method.
The philosopher's stone, a longtime "holy Grail" of Western alchemy, is a mythical substance that supposedly could turn inexpensive metals into gold and/or create an elixir that would make humans immortal.
In modern times, Philosopher's Stone became a slang name for an hallucinogenic mushroom, Psilocybe mexicana, closely related to the more well-known Psilocybe cubensis. See Psilocybe.
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