NOVELTY - Producing silicon dioxide, comprises (a) preparing template from an acidifying agent or acidifying agent and water with a pH-value of less than 2, preferably less than 0.5, (b) providing silicate solution with a viscosity of 0.2-2 Poise, (c) adding silicate solution from step (b) into the template from step (a) such that a pH-value of the precipitate suspension at any time remains to a value of less than 2, preferably less than 0.5, (d) separating and washing the silicon dioxide, where the washing medium has a pH-value of less than 2, preferably less than 0.5, and (e) drying silicon dioxide.    USE - The silicon dioxide is useful for the production of elementary silicon, as high purity raw material for the manufacture of high-purity quartz glass for optical fiber or glass unit for laboratory and electronics, as a feedstock for the production of high-purity silica sols for polishing discs of high purity silicon (wavers), for the production of glass blanks, e.g. boules, glass molded articles, such as pipe systems, e.g. overcladding tubes, core rods or inner cladding material in optical fibers, for the production of core materials in planar waveguides, crucibles, optical lenses and prisms and photomasks or diffraction gratings, electrical, thermal and magnetic insulators, for the manufacture of vessels and equipments for the chemical, pharmaceutical and semiconductor industries and solar industry, for the production of glass rods and glass tubes, for coating metals, plastics, ceramics or glass, as a filler in metals, glasses, polymers, elastomers and coatings, as a polishing agent for semiconductor materials and electrical circuits, for the manufacture of lamps, or as support material in the manufacture of solar cells (claimed).    ADVANTAGE - The process provides the silicon dioxide with high purity and without including a calcining step.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: the silicon dioxide, which has a circular shape and obtained by the above process.