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What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?

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Glass is an amorphous form of silica.In glass $SiO_4$ tetrahedra are randomly joined to each other.It does not have a long range regular structure and no sharp melting point.On heating it softens and melts over a wide range of temperature.
Quartz is a crystalline form of silica.In quartz $SiO_4$ tetrahedra are regularly joined to each other and have long range regular arrangement.It has a sharp melting point.If quartz is melted and the melt is cooled very rapidly,it changes into glass
On melting quartz and then cooling it rapidly.It is converted into glass.
answered Jul 29, 2014 by sreemathi.v
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