Besides being instrumental in the determination of “hiddenite,” Hidden discovered another new precious stone, the garnet variety “rhodolite” (from rhodon, the Greek for rose) in the Cowee Valley, Macon County, North Carolina. He also discovered a number of new mineral varieties, one of which, a form of rutile, he named “edisonite,” after Thomas A. Edison1; another, a hydrous silicate of thorium and uranium, he named “mackintoshite” after his faithful collaborator, J. B. Mackintosh. In connection with the latter, Hidden also described auerlite, a hydrous phospho-silicate of thorium, named after Dr. Carl Auer von Welsbach, inventor of the Welsbach light; sulphohalite, a chloro-sulfate of sodium; yttrialite, a silicate of the yttrium metals and thorium; thorogummite, a silicate of thorium; and rowlandite, a silicate of yttrium, named after Prof. Henry A. Rowland.

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