a fine-grained crystalline material that was formed as a glass and subsequently devitrified (crystallized).
Found on http://www.tulane.edu/~bmitche/book/glossary.html
Glass-ceramics are polycrystalline material produced through controlled crystallization of base glass. Glass-ceramic materials share many properties with both glasses and ceramics. Glass-ceramics have an amorphous phase and one or more crystalline phases and are produced by a so called "controlled crystallization" in contrast to a spontaneous cr..
Found on http://en.wikipedia.org/wiki/Glass-ceramic
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