CC · H 2 O , ▁rapidly ▁de h yd r ates ▁to ▁A CC . ▁Following ▁the ▁de h yd r ation , ▁within ▁ 2 4 ▁hours , ▁all ▁of ▁the ▁A CC ▁will ▁have ▁transformed ▁into ▁cal cite . ▁ ▁Syn th etic ▁A CC ▁Many ▁methods , ▁have ▁been ▁de vised ▁for ▁synth et ically ▁producing ▁A CC ▁since ▁its ▁discovery ▁at ▁ 1 9 8 9 , ▁however , ▁only ▁few ▁synth eses ▁successfully ▁stabil ized ▁A CC ▁for ▁more ▁than ▁several ▁weeks . ▁The ▁best ▁effective ▁method ▁to ▁stabil ize ▁A CC ▁lifetime ▁is ▁by ▁forming ▁it ▁in ▁the ▁presence ▁of ▁mag nes ium ▁and / or ▁ph osph orus . ▁Also , ▁A CC ▁cry st all isation ▁path ways ▁have ▁been ▁observed ▁to ▁depend ▁on ▁its ▁M g / Ca ▁ratio , ▁transform ing ▁to ▁a rag on ite , ▁M g - cal cite , ▁mon oh ydro cal cite ▁or ▁dol om ite ▁with ▁increasing ▁M g ▁content . ▁Hu ang ▁et ▁al . ▁managed ▁to ▁stabil ize ▁A CC ▁using ▁poly ac ry lic ▁acid ▁for ▁several ▁months , ▁while ▁Lost e ▁et ▁al . ▁showed ▁that ▁mag nes ium ▁ ions ▁can ▁increase ▁A CC ▁stability ▁as ▁well . ▁But ▁only ▁the ▁discovery ▁that ▁as part ic ▁acid , ▁g ly c ine , ▁cit rate , ▁and ▁ph osph ory l ated ▁am ino ▁ac ids ▁can ▁produce ▁long ▁term ▁stable ▁A CC ▁have ▁opened ▁the ▁door ▁for ▁production ▁commercial