Any of the forms of silicon dioxide (SiO 2 ), including quartz , tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony.
Various kinds of silica minerals have been produced synthetically.
Any of the forms of silicon dioxide (SiO 2 ), including quartz , tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony.
Various kinds of silica minerals have been produced synthetically.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012