Glass-ceramic

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-ceramic

Glass-ceramics are polycrystalline materials 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 c.....
Found on http://en.wikipedia.org/wiki/Glass-ceramic
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