Alchemy, Ancient Art and Science is a book written by a servant of Lord Voldemort, Argus Pyrites. The book includes information about the Philosopher’s Stone (JKR).
Pyrite is a mineral, more commonly known as fool's gold.
This book is mentioned in an early draft of Philosopher's Stone as Hermione's source of information about alchemist Nicholas Flamel. It was included in the Scrapbook section of JKR's Official Site, and since it was not included in the final draft, is not considered canon.
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