Qeexitaanka qaamuuska diatomite (sidoo kale loo yaqaan dhulka diatomaceous) waa dhagax jilicsan oo sedimentary ah kaas oo ka kooban hadhaaga diatoms ee fossilized, nooc algae microscopic ah. Waxaa inta badan loo isticmaalaa sida wakiilka shaandhaynta sababta oo ah porosity sare iyo awood u leh inuu nuugo wasakhda, iyo sidoo kale codsiyada kala duwan ee warshadaha sida dahaarka, budada abrasive, iyo sida qaboojiyaha ciidda.