Lub xub ntiag ntawm silica yog crystalline thiab amorphous . Quartz Crystal yog crystalline silica, silicon dioxide crystals thiab oxygen atoms nyob rau hauv atomic ratio ntawm 1: 2 atomic composition ntawm lub network three-dimensional crystals, nrog nyias siv lead ua thiab xim.
Amorphous hais txog cov qauv ntawm qee thaj chaw uas tsis tiav tiav crystalline amorphous (amorphous regions) los sis qee yam amorphous khoom (amorphous) muaj pes tsawg leeg. Ntau yam ntawm cov khoom uas muaj peev xwm ua rau muaj cov kw yog amorphous, thiab reactivity feem ntau ntau dua li ntawm cov khoom qub.
Amorphous silicon , tseem hu ua amorphous silicon, yog ib hom silicon allotropes. Crystalline silicon feem ntau yog tetrahedron, thiab txhua silicon atom yog nyob rau ntawm apex ntawm lub tetrahedron thiab cov kev sib txuas lus mus rau lwm yam plaub silicon. Cov qauv no muaj peev xwm yuav ncav lub hauv paus loj heev, yog li ua tus qauv ruaj khov. Thiab tsis muaj cov yeeb tshuaj silicon tsis muaj nyob rau hauv cov kab txuas mus txuas ntxiv, txoj kab nruab ntug ntawm cov atoms tau muaj teeb meem.