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John Sinkankas

John Sinkankas, known the world over for his writings on mineralogy, and gem cutting, dated his interest in minerals to the age of seven when he collected minerals in his native Paterson, New Jersey. Since retiring from a twenty-five-year career as a naval aviator, he has pursued a second successful career in mineralogy. He is the author of four other books. In addition, he contributed hundreds of articles to amateur and professional journals, and was a member of many gem and mineral societies....See more