Science: Opals

Despatches from Nevada related the discovery, in mountainy canyons near Winnemucca, of extensive deposits of opals, those iridescent gems, glowing blue, green, yellow, pink and deep red, for which the world has previously depended chiefly upon mines in Hungary, Mexico, Honduras, Australia. Geologists reported that the stones had been formed after a petrified forest was prehistorically inundated by volcanic ash and lava. Made bold by successful recent raids on Nevada gold mines, bandits broke into a store of the gems laid away by prospectors, but soon found their precious loot turned to worthless...

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