A systematic study of 10 glasses belonging to the system diopside-anorthite (CaO-MgO-Al203-Si02 quaternary system) has been carried out. An interpretation of the structure of these glasses has been sought by means of thermal, thermo physical and physical measurements. Particularly it has been pointed out that, going from one end term of the series to the other, i.e. by increasing the Al and decreasing the Mg content, the glass transition and softening temperatures increase underlining the role played by Al as glass former and the linear thermal expansion coefficient and the system compactness decrease because of the progressive decreasing content of network modifier Mg. Further, system properties satisfy the additive semi empirical models based on the general characteristics of the constituent ions.
