Stability of Glass in the Geologic Environment: Some Evidence from Studies of Natural Silicate Glasses

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Abstract
The geologic literature contains numerous studies of the stability of natural silicate glasses under a variety of environmental conditions. The processes of glass hydration, devitrification, and dissolution are described and their rates are estimated from field and laboratory observations. These processes can also affect any glass proposed as a waste solidification medium. Observations of natural silicate glasses are particularly informative if waste disposal glasses are similarly reactive. Review of the data for natural silicate glasses suggests that