stages thermal treatments. Obtained glass-ceramics were characterized by DTA, X-ray diffraction and scanning
electron microscopy. The heat treated samples at 705C/3 h + 1000C/15 min showed 2570.32
98 MPa microhard-ness. The effect of heat treatment and preparation methods on microhardness and microstructure were studied.
The microstructure of samples showed phlogopite and forsterite phases and solved or soft edge in the semi-rod
like crystals was recorded which can explain the small value of microhardness. The various microhardness were
determined in the range between 1591.61 to 9610
147 MPa.