0.99 0.01 1.00 Fig. 3.42 . Section of octahedral crystal of gold in uraninite. Gold can be found in quartz, uraninite, brannerite and rarely in arsenopyrite.
Gold overgrows, encloses and cuts the above mentioned minerals.
Ag from 2.7 to 3.1, Hg from 2.0 to 2.6, Bi from 0.4 to 0.9 and Cu up to 0.3 wt. It occurs in interstices and borders of quartz grains. They presume common origin of inorganic minerals and carbonaceous compounds from deep hot and slowly cooling source.