Bismutové minerály v křemenném valounu se zlatem z náplavů Otavy u Annína (Šumava)

Pages 33-35
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2008/16/1

Gold of high purity (98.6 %), found in quartz pebble from alluvial placers of Otava river near Annín, north of Rejštejn at the Šumava Mountains (Czech Republic), is associated with both native bismuth and joséite A with empirical formula (Bi3.92Au0.03Ag0.04)Σ3.99(Te0.97S2.04)Σ3.01. Joséite A is supposed to crystalize from reduced fluids with higher sulphur fugacityand at a relatively high temperature about 266° C. Native bismuth as well as joséite A are mostly altered into supergenic Bi and Bi-Te oxidic phases with variable chemical composition.

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