Goldfieldite, Famatinite
Combination Mine, Goldfield Mining District, Esmeralda County, Nevada, USA
7.0 x 4.0 x 3.0 cm. Reniform masses of metallic gray to gray-bronze goldfieldite overgrown by crustiform banded quartz and carbonate, a texture typical of epithermal gold deposits. Goldfieldite also occurs as tiny (<0.5mm) crystals and nubby clusters that locally protrude from the white quartz druse. Isolated euhedral to subhedral, brown-red, sub ...
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