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Potassium Germanifluoride, K2GeF6

Potassium Germanifluoride (Fluogermanate), K2GeF6, is obtained in the course of extraction of germanium from argyrodite. It is best prepared1 by dissolving 2 parts of germanic oxide in 12 parts of a 20 per cent, solution of hydrofluoric acid and adding 3 parts of potassium chloride in concentrated solution. After first separating as a jelly the salt is eventually obtained in hexagonal crystals isomorphous with ammonium silicifluoride. According to Winkler 1 part of potassium germanifluoride dissolves in 174 parts of water at 18° C. and in 34 parts at 100° C.

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