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Frank Wigglesworth Clarke

American chemist
Frank Wigglesworth Clarke of Boston, Massachusetts, and Washington, D.C. was an American scientist and chemist. Sometimes known as the "Father of Geochemistry," Clarke is credited with determining the composition of the Earth's crust. Wikipedia
Born: March 19, 1847, Boston, MA
Died: May 23, 1931 (age 84 years), Chevy Chase Manor, Chevy Chase, MD
Children: Una Hunt
Affiliation: Smithsonian Institution
Research interests: Geochemistry and Evolution