Apatite/wollastonite (A/W)-phlogopite (Ph) glass-ceramics of various compositions were prepared by means of pressureless sintering of two frit mixtures. Sintering conditions were studied by differential thermal analysis (DTA) and hot-stage microscopy. The sintered samples were characterized by X-ray diffraction. The results showed that by addition of a frit of phlogopite composition to a frit of A/W composition, the crystallization temperature decreases which results in suppressing the sintering process. The 50-50 frits mixture could be sintered to 0.90 relative density after 1 h heating at 1100 degrees C. The type and sequence of formation of crystalline phases were also modified. Whereas the A/W glass-ceramic crystallized to apatite and wollastonite, the crystallization products of 50-50 frits mixture were fluoro-apatite, wollastonite, diopside, and mellilite.