**4. Conclusion**

Magnesium aluminum silicate (MAS) glass ceramic was prepared successfully by sintering route and characterized in terms of both phase evolution during firing and microstructure at the optimum sintering temperature. The chemical composition of specimen MAS-G8 was found appropriate as compared to other compositions. The 9.14% weight loss was observed in specimen MAS-G8 after heating up to 900oC by TG-DTA and found thermally stable above 900oC. MAS-G8 sintered at temperature 1040oC provided smaller and uniform particle size distribution, 93% theoretical density. The phase evolution examined by XRD revealed that three main phase fluorophlogopite (F), sillimanite (S) and leucite (L) were present in the prepared magnesium aluminum silicate glass ceramic specimens as result of different chemical reactions during firing; however the specimen MAS-G8 consists of predominant fluorophlogopite glassy phase with uniform particle size distribution. Radiographic studies show the least (3-4%) through porosity whereas SEM image indicates some surface porosity.
