A UV-blocking glass material having precipitated cuprous halide crystals and including by weight percent, on an oxide basis: from 30 wt % to 65 wt % SiO2; from 12 wt % to 25 wt % B2O3; from 3 wt % to 10 wt % Al2O3; from 0 wt % to 7 wt % Na2O; from 0 wt % to 10 wt % K2O; from 0 wt % to 5 wt % Li2O; from 0.5 wt % to 10 wt % Ho2O3; from 0.25 wt % to 1.50 wt % CuO; and from 0.5 wt % to 5.0 wt % halogens.