To further decipher the importance of the OH -and Sr 2+ concentrations on anisotropic growth, we substituted KOH with KCl in the hydroflux. The H2O:K ratio (q(H2O)K value) is then maintained while OH -ions are replaced by Cl -, decreasing the basicity of the hydroflux. We then introduce a new parameter, q(Cl), to quantify the extent of substitution: q(Cl) = KCl:K molar ratio.