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What makes glass different from a solid ...

What makes glass different from a solid such as quartz? Under what Conditions Could quartz be Converted into glass?

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Quartz is crystalline solid, the C0nstituent particles have long range order. But glass is an amorphous solid in which the particles have only short range order. If quartz is melted and the melt is C0oled glass is formed which is amorphous.
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