What mineral did John Casper Branner discover in Arkansas?
Bauxite
Gypsum
Feldspar
Quartz
Answer
John Casper Branner discovered bauxite, the primary ore of aluminum, in Arkansas in 1887 while serving as State Geologist for the Geological Survey of Arkansas. This discovery was significant as it led to the development of the aluminum industry in the United States.
John C. Branner Brain Challenge: 19 Questions to Push Your Limits
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