Feldspar raw materials from Karelia for electrical industry

The possibility of using quartz-feldspar rocks of Karelia for the production of electrical ceramics is shown. It was found that cakes of alkaline syenites are distinguished by low dielectric losses (0.25) and dielectric constant equal to 6.5. Volcanogenic rocks - quartz porphyry with a high content of quartz and microcline - reduce the dielectric constant of the cakes to 5.4, and the potassium gelleflint has a dielectric constant similar to that of pegmatites - 7.7. Tab. 1, ill. 2, bibliography: 4 titles.