Izinto zokwenza imveliso yodongwe oluphezulu olucekeceke olwenziwe ngezitena eziphikisayo

Ezona zinto ziphambili zenziwe ngodongwe oluphezulu lwesitena ezakhiwe ngezitena zodongwe oludlolo (oludongwe lukhuni, lwekaolin okanye lwe-pyrophyllite kunye nesanti ye-quartz yendalo.Ngokweentlobo ezahlukeneyo zezinto ezisetyenzisiweyo, izitena zodongwe eziphezulu zingahlulwa zibe yi-quartz-kaolinite ephezulu Zimbini iintlobo yezitena ze-silica kunye ne-quartz-udongwe oluphezulu-lwesitena sodongwe.