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бумажная глина stresses
ecol.	fiberclay ("Paper clay (sometimes referred to as fiberclay) is any clay body to which processed cellulose fiber (paper being the most common) has been added." wikipedia.org BAR); fiber clay ("Paper clay (sometimes referred to as fiberclay) is any clay body to which processed cellulose fiber (paper being the most common) has been added." wikipedia.org BAR)
geol.	paper clay
silic.	paper clay (тонкозернистый каолин с высокой водоудерживающей способностью)