Opoka

Opoka, dar geologiya, jinsi kuhii tahshiniero guyand, ki mustahkami masomador ast. Asosan az duoksidi silisiyi amorfi (to 97%) va omekhtahoi gil, peg, glaukonit va gayra tarkib yoftaast. Rangash khokistarii ravshan va tira, bazan siyohtob.

Khelhoi tozai Opoka khususiyati balandi adsorbsioni dorand. Opoka dar bahrho bo rohi khimiyavi hosil meshavad. Onro beshtar dar takhnishasthoi davrai paleogen va qisman davrai taboshiri bolo paydo kardan mumkin ast. Dar sokhtmon, inchunin ba sifati adsorbent ba kor meravad.