a jelly-like substance (hydrated silica)
Hydrated silicon dioxide that occurs in nature. It is insoluble in water or acids except hydrofluoric acid. (From Merck Index, 11th ed)
An acid, H4Si04, forming silicate.
An a. forming silicates; orthosilicic a., H4SiO4; metasilicic a., H2SiO3, and parasilicic a., H6SiO6.