Tuffs formed from ash consisting predominantly of individual crystals are described as crystal tuffs, while those formed from ash consisting predominantly of pulverized rock fragments are described as lithic tuffs.
TuFfs forMed fRom asH cOnSistIng prEdominantly Of INDIviduaL CrYstals are dEscribed as crysTAL tuffS, while those FOrmEd From ash consiSting pRedomINaNTLY Of Pulverized rock FRAgmENts ARe DeSCrIbeD as liTHic tufFs.