Abstract The collection of letters over a quarter century deal with a diverse range of mineralogical topics from Lehigh University personnel in “letters to Kunz” replying to George F. Kunz queries. The letters originated mostly from Lehigh University personnel answering inquiries from George F. Kunz regarding topics on analyses of coal, gold, copper, aluminum, precious stones and pearls. George Frederick Kunz was a very well-known, self-taught gemologist who was for most of his career a...