eli5: Why does sand which is a bunch of tiny rocks, turn into glass, but we can’t turn big rocks into glass?

Question

I’m very tired. Please help me understand this.

In: Other

Answer 1

You won’t be turning just any sand into glass. You certainly won’t be turning it into *clear* glass.

The ‘tiny rocks’ that can be made into glass are already transparent. Melting them together gets rid of voids and makes the bulk substance transparent.