Glass can actually be made from a variety of materials, and its defining characteristics aren’t actually its transparency but rather its molecular structure and properties.
What we generally call glass is mainly made from silica which is mostly found in sand, but what we call sand is actually a bunch of stuff and there are many different kinds of sand, but if you’re looking for silica, it’s in sand, because what we call sand is mostly silica.
Basically once you remove all the other random shit and keep those you want you can make clear and transparent glass. If it has impurities it’s not transparent.
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