Abstract
The viscosity of Libyan desert glass has been determined over the temperature range 975°C to 1090°C. Its viscosity of 1013 poises at 1000°C and 1010 at 1250°C is approximately 2 orders of magnitude less than that of fused silica, but it is 3½ orders of magnitude greater than that of moldavites and 6½ orders of magnitude greater than that of obsidian. The viscosity has been used to calculate the time-temperature relation necessary to ‘fine’ the Libyan desert glass and to remove the larger gas bubbles. For the six samples studied, it would take 47 days at 1600°C to remove the bubbles larger than 0.2 mm diameter, the largest diameter found in our samples. The time needed to remove the larger bubbles would be 0.5 day at 1800°C and 2 min at 2000°C.
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