ELECTRUM grains within dark gray bands of NAUMANNITE and white QUARTZ (Var: Chalcedony) Knob Hill Mine (Golden Promise Mine), Klondike Mountain, Republic, Republic District, Ferry County, Washington, USA Slabbed ore specimen is 14.7 x 8.7 x 2.6 cm (5-13/16 x 3-7/16 x 1 in) Ralph Noyes Collection Photo Copyright © 2014 Jeffrey M. Schwartz
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