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Asteroids
Asteroids
Nov., 2019

“The possibility of successfully navigating an asteroid field is approximately 3,720 to 1!” This famous movie line captures the appearance of the microscope image shown here. In this case, the “asteroids” are actually clumps of unmelted silica (SiO2) grains in glass. Although the clumped nodules were unusual, the individual grains were typical of silica batch stones. Silica batch stones are caused by a number of batching or melting issues, including increased furnace pull, batch segregation, or insufficient melting temperatures.