This study evaluated the effect of aluminum phosphate (AlPO4) additions on the crystallization behavior and bioactivity of potassium fluorrichterite glasses and glass-ceramics. Four glass compositions with increasing amounts of AlPO4 were melted. Mica and fluorrichterite were present in all glass-ceramics after crystallization. The microstructure consisted of platelet-shaped mica and prismatic fluorrichterite crystals. After incubation in simulated body fluid, a layer consisting of spherical-nanosized particles was present on the surface of the glasses. X-ray diffraction revealed the presence of hydroxyapatite after incubation of the glass and glass-ceramic powders. The addition of AlPO4 promoted mica nucleation and bioactivity in K-fluorrichterite glass-ceramics.