Question

Quartz is a crystalline solid but it changes in to amorphous. How?
no spamm

Answer 1

Yes they can.

But not very easily, it can be converted by many method but still involves various tedious steps.

As far as I know,

The simplest method is to convert it by heating it till its melting point and then quickly cool it down rapidly (With liquid N2). This will prevent recrystallization, Any future heating past its crystallization temperature will of course lead to recrystallization.