crystalline silicon was obtained by

Silicon. The element silicon has two allotropic modification (a) Amorphous silicon (b) Adamantine silicon. A third allotropic modification has been observed and is of doubtful character known as graphitoidal silicon. Amorphous silicon is obtained by heating well-powdered quartz of finely silica with magnesium powder in a fireclay which is suitable for the manufacute of crucibles. SiO_(2)+2Mg to Si+2MgO The product is washed with dilute HCl to wash away MgO and then with hydrofluoric acid to remove uncharged silica. Crystalline silicon may be obtained by heating potassium silicon fluoride with

Statement-I : Adamantine silicon is obtained by heating silica with aluminium. Statement-II : Adamantine silicon is an alloy of aluminium and silicon.