philosophers stone

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(or philos′opher's) stone`,

a substance sought by alchemists that would be capable of transmuting baser metals into gold or silver and of prolonging life.
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References in periodicals archive ?
Philosophers Stone by scientist, adventurer, inventor, and entrepreneur Hank Kroll, is an amazing study of the monatomic element (the m-state) or white-powder-of-gold carried in the Ark Of The Covenant of ancient Israel.