1. In addition, contact with eyes may form silicic acid with resultant irritation. 2. Rocks high in silica produce silicic acid as a weathering product. 3. Choanoflagellate biosilicification requires the concentration of silicic acid within the cell. 4. The silicic acid , when weathered, forms black streaks, which give the rock its characteristic appearance. 5. It is thought that fossils were pervaded with silicic acid due to this volcanic activity. 6. The biogenic silica composing the cell wall is synthesised intracellularly by the polymerisation of silicic acid monomers. 7. Diatoms need, among other nutrients, silicic acid to create biogenic silica for their frustules ( cell walls ). 8. The researchers found that the mirrors slowly broke down into harmless silicic acid in simulated human blood plasma. 9. Their distinguishing feature is a hard mineral shell or frustule composed of opal ( hydrated, polymerized silicic acid ). 10. Another positive attribute of porous silicon is the degradation of porous silicon into monomeric silicic acid ( SiOH4 ).
