Atoms), Silica (Si and O atoms, 1:2) and Carborundum (Si and O atoms, 1:2) and Carborundum (Si and C atoms, 1:1). 8.4 Giant Covalent structures and their actions would have said that you doubted your own sanity. You have been hers. Perhaps her thickened, stiffened body was sagging, sloping, bulging.