No matter how much you cool a glass, it won’t crystallise. You have to go over the glass transition temperature and cool down slowly enough for crystals to form. In the case of silica glass, that’s not going to happen, though, because it’s a “strong glass former” - it doesn’t crystallise unless you do something pretty extreme.
On the scale of millions of years, everything flows.
Well, if it is a type of glass, it will flow until it is able to cool enough to crystallize
No matter how much you cool a glass, it won’t crystallise. You have to go over the glass transition temperature and cool down slowly enough for crystals to form. In the case of silica glass, that’s not going to happen, though, because it’s a “strong glass former” - it doesn’t crystallise unless you do something pretty extreme.
Ah OK, I thought on geologic timescales it would separate out and form back into quartz, etc at STP but I’m happy to be wrong and learn something new.