The Seed Sprouts And Grows

a: Nucleation ~
b: germination of the crystal

What: "If the funky fused glass had been caused by crystal growth, it would make sense that it happens during cooling. The mechanism for crystal growth (also called devitrification) has two phases: nucleation and growth. Nucleation is like germination of the crystal. It happens at higher temperatures (above 1500F). Then crystal growth takes place at lower temperatures (between 1000 and 1200F). That is one reason many people think the glass fogs only as it cools. If you want to learn more about this, Google glass-ceramics, or go to any materials science library. There are many books on it."

Writer: Edward Boisson
Date: Oct 11 2013 7:05 PM

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