corundum, USA.12, North Carolina.12, Montana.12, gems

The section on precious stones, authored by George F. Kunz, highlights notable discoveries and mining activities for various gemstones such as emeralds, diamonds, beryl, phenacite, topaz, garnet, epidote, agatized wood, fire opal, dumortierite, tourmaline, rhodonite, turquoise, gadolinite, fluorite, and amber. ​ It details specific finds, their locations, and the values of the stones, emphasizing the potential for future mining and commercial use. ​