The flocculating effectiveness of mixtures of various fatty amines with colloidal chrysotile asbestos was studied to determine the extent to which the amine and the asbestos act in concert as polycations. Tallow 1,3-propylene diamine was the principal amine studied, although other fatty amines showed similar properties. Aqueous solutions of the amine defibrillate the chrysotile into primary tubules about 250 Å in diameter and several microns in length. It is believed that the amine molecules adsorb on the surface of the chrysotile tubules, promoting their defibrillation and the high stability of the resultant dispersion. The flocculating effectiveness of the arnine/asbestos mixtures was determined on several neutral or anionic mineral suspensions including titania and kaolin by measuring sedimentation rate and volume. The flocculating effectiveness was also determined on a suspension of hydrophilic organic matter, partially digested diluted municipal waste, by measuring filtration rate. The amine/asbestos mixtures are more effective flocculants than either the amine or the asbestos alone. Moreover, in contrast to behavior frequently observed with conventional polymeric flocculants, the mixtures show little tendency to restabilize the suspended matter at higher than optimum concentrations.