Mystery #4Tier 3chemistry / solids
Why isn't glass a crystal?
Salt, sugar and quartz are all crystals, with neat flat faces and hidden patterns inside. Glass is hard and solid too, yet it has no faces, no crystal shape, and you can see straight through it. Some people even claim old window glass is secretly a slow-flowing liquid. So what exactly is glass, if it isn't a crystal?
Your guess
What's your hunch about why glass doesn't count as a crystal like salt or quartz?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.