(a) Volume fractions of CaP populations with spherical morphologies, Vsp, at 5–15 h and (b) volume fractions of plate-like shapes, Vpl, at 15 h, determined from fittings of SAXS patterns. No plate-like shape particles were identified from SAXS patterns of MC0p below 0.3 mm. The volume fractions of each particle population were estimated by calibrating I(q) using a glassy carbon reference sample.