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We assess the predictive power of alchemical perturbations for estimatingfundamental properties in ionic crystals. Using density functional theory wehave calculated formation energies, lattice constants, and bulk moduli for allsixteen iso-valence-electronic combinations of pure pristine alkali halidesinvolving elements $A \in \{$Na, K, Rb, Cs$\}$ and $X \in \{$F, Cl, Br, I$\}$.For rock salt, zincblende and cesium chloride symmetry, alchemicalHellmann-Feynman derivatives, evaluated along lattice scans of sixteenreference crystals, have been obtained for all respective 16$\times$15combinations of reference and predicted target crystals. Mean absolute errors(MAE) are on par with density functional theory level of accuracy for energiesand bulk modulus. Predicted lattice constants are less accurate. NaCl is thebest reference salt for alchemical estimates of relative energies (MAE $<$ 40meV/atom) while alkali fluorides are the worst. By contrast, lattice constantsare predicted best using NaF as a reference salt (MAE $<$ 0.5{\AA}), yieldingonly semi-quantitative accuracy. The best reference salt for the prediction ofbulk moduli is CsCl (MAE $<$ 0.4$\times$10$^{11}$ dynes/cm$^2$). Alchemicalderivatives can also be used to predict competing rock salt and cesium chloridephases in binary and ternary solid mixtures with CsCl. Alchemical predictionsbased on dispersion corrected density functional theory with pure RbI as areference salt reproduce reasonably well the reversal of the rock salt/cesiumchloride stability trend for binary $(AX)_{1-x}$CsCl$_x$ as well as for ternary$(AX)_{0.5-0.5x}(BY)_{0.5-0.5x}$CsCl$_x$ mixtures.

Rapid yet accurate first principle based predictions of alkali halide crystal phases using alchemical perturbation