Berzelius (Jahresb., 182 5, 4, p. 91) by the action of chlorine on silicon, and is also obtained when an intimate mixture of silica and carbon is heated in a stream of chlorine and the products of reaction fractionated.
For this purpose the crude distillate is redistilled over sulphuric acid and then fractionated.
The precipitated sodium chloride is filtered, and the solution of hydroxylamine distilled in order to remove methyl alcohol, and finally fractionated under reduced pressure.
The three volcanic cones are relatively old and comprise late-stage fractionated and highly vesicular basalt.
These extracts were analyzed using thin layer and HPLC and then fractionated.
