Umusenyi wa kwarutsi woguwe (SiO₂) ufite ibumba, ibyuma cyangwa ibinyabuzima bike cyane. Ni ikintu cy'ibanze mu gukora ikirahure (uvanze n'ivu rya soda n'isarabwayi), kandi ukoreshwa nk'ikintu cy'igishushanyo kirwanya umuriro, nk'ikigwa no nk'inkomoko ya silika mu bwisiga bw'ibumba. Ibyuma birimo bitanga ibara ry'icyatsi cyangwa iry'umukara mu kirahure.