A sample of Dioptase is an emerald-green to bluish-green copper cyclosilicate mineral. Dated 20th Century

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 20th, archival, archive, blue, bluish, bluish-green, century, copper, cyclosilicate, dioptase, emerald, emerald-green, geology, green, historical, history, mineral, natural, nature, sample