It's because different colours of light traverse at different speeds, when they're all traversing at the same speed the light colour is, 'transparent' light traverses at different speeds through crystals / glass due to refraction.
Make 3 of everything
No you can make some crystals with table salt by making a saturated solution look how to do it on line
There are many ways to make crystals from scratch.
All salts make crystals.
I suppose Lycopene make fresh tomatoes colorful
what do you need to make a borax crystals
everywhere you look atoms are make everything
to make crystals grow
Make everything pink.
Learn how to make crystals. This is a collection of easy crystal growing recipes, with photos of what the crystals look like and tips for how to make your crystals a success.Sugar Crystals or Rock CandyAnne Helmenstine Rock candy or sugar crystals are especially good to grow because you can eat the finished crystals! The basic recipe for these crystals is:3 cups sugar1 cup boiling waterYou can add food coloring or flavoring to the liquid, if you want. It's easiest to grow these crystals on a thick string hanging from a pencil or knife into the solution. For best results, remove any crystals that aren't growing on your string.
They are, but you need to be able to look after them properly and make sure you have everything it needs.
Sure, because crystals make rainbows.