Abstract
The gas content of natural and artificial glasses depends on the raw materials, the melting temperature and pressure, further on the cooling rate, too. From the gas content, the degassing rate and the temperature of maximum degassing rate one can get useful informations about the bonding of volatile compounds and the history of glasses. It is shown how the “fining”-components influences the gas content and degassing rate of a soda-lime-silicate-glass.Furthermore different types of natural glasses are investigated as e.g. Obsidian, glassy samples from Macusani, Peru and Zhamanshin structure, Kasakhstan, USSR. The EGA-curves from the natural glasses shown that the mechanism of degassing is quite different in comparison with the artificial glass. In the “fining”-range, that is the range with the bursting of bubbles, are H2O and CO the dominant volatiles. It turned out that the degassing mechanism and the gas content of the black glassy objects from the Zhamanshin structure (“Irghizites”) is similar to the volcanic glasses and quite different to the tektites.
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