Sodium　lignosulfonate　(SL),　a　byproduct　of　the　pulping　industry,　was　used　as　a　stabilizer　for　the　mineralization　of　CaCO3.　In　a　calcium　acetate-urea-water　system,　the　direct　aging　of　the　aqueous　solution　of　calcium　acetate　and　urea　resulted　in　the　formation　of　mixed　aragonite　and　vaterite　phases　or　a　pure　aragonite　phase　depending　on　the　aging　time.　However,　SL　was　introduced　into　the　calcium　acetate-urea-water　system　to　markedly　stabilize　the　formation　of　a　thermodynamically　unstable　vaterite　phase.　Various　morphologies　of　vaterite　structures　were　observed　by　adjusting　the　concentration　of　urea　and　SL　as　well　as　the　aging　time.　Based　on　these　results,　ion　exchange,　carbonate　attacking　the　calcium(II)　ions,　aggregations　of　SL-stabilized　primary　CaCO3　particles　through　oriented　attachment　and　Ostwald　ripening,　as　well　as　mesoscale　self-assembly　were　proposed　as　mechanisms　to　elucidate　the　formation　of　various　morphologies.