OBERAAR-GRIMSEL WATER TUNNEL, OBERAAR POWER STATION, BERN, SWITZERLAND
Dimensions: 4.5 X 3.6 X 3.5 cm.
Group of orthoclase crystals (adularia) with well defined faces and edges, translucent, brilliant and interpenetrating each other. They are accompanied by a group of smoky quartz crystals, one with a developed prism and another more flattened, with good transparence. THE MAIN CRYSTAL IS: 3,5 x 1,6 x 1,4 cm.