Growth morphology of berlinite crystals obtained under hydrothermal conditions

The growth morphology of berlinite (AlPO 4 ) crystals obtained under hydrothermal conditions depends on the solvent employed (H 3 PO 4 , HCl, H 2 SO 4 , and their mixtures) and the crystallization temperature. We have constructed a morphological diagram (morphogram) showing the resulting habits by changing the relative growth rates of the r (1011) and π (1012) faces with respect to the m (1010) face, and keeping the ratios between the growth rates of the first two types of faces and the growth rates of the z (0111) and π'(0112) constant and equal to 0.9. This allows us to compare these polyhedra with those obtained in the growth runs