4
K feldspars contain about 20 40 ppm Ga and 2 3 ppm Ge albite contains c 30 60 ppm Ga and 2 4 ppm Ge There are only small differences in the Ga and Ge contents in feldspars among particular plutons Quartz generally contains only about ppm Ge and less than ppm Ga Tab 04 Tab 4 Contents of Ga and Ge in the studied