Hard tissue diseases and defects, e.g. osteoporosis and osteoarthritis, are some of the most significant medical conditions that lead to the extensive need for the use of appropriate synthetic materials. Although hydroxyapatite has been widely used as osteoconductive biomaterial; carbonated apatite are more similar to the inorganic component of bone. Bone, dentine and dental enamel contain carbonated apatite of different compositions with a few per cent of carbonate ions (from 2 to 8 wt-%). It is well known that hydroxyapatite structure can host carbonate ions at two different sites: site A, where they substitute OH– ion, and site B, where they replace PO43– ions. In this work, A+B-site replacement carbonated apatite was obtained with carbonate content of 6 to 7 wt-%. When immersed in simulated body fluid, scanning electron images showed the ability to mineralise new apatite within 0·5 days of immersion.