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

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.