Calcite growth under controlled diffusion

Summary The growth of calcite was studied in a gelatin-gel medium under variable environmental conditions by 2 different methods. The results suggest that the organic matrix, the temperature, the diffusion fluctuation depending on ionic concentrations, and the presence of additives exert a fine control on the evolution of single crystals, polycrystalline aggregates, and highly structured concretions of calcite.Presented at the 22nd Canadian Conference on Pharmaceutical Research, Montreal (Quebec), Canada, 16 May 1975.Acknowledgments. This work was supported, by the Medical Research Council of Canada. — The authors are indebted to Dr J. M. Dorlot, Department of Metallurgy, Ecole Polytechnique, Montreal, for the use of the scanning electron microscope and thanks are due to Mr J. Claudinon for his technical assitance.