some crystals are and some aren't.
Gemstones are more valuable and rare and have more vibrant colors and come in more colors. There is more types of gemstones then crystals.
because all crystals are metals .
All crystals are diffrent sizes ?
Diamonds are formed in a crystalline structure from carbon. Not all crystals are formed from carbon; not all crystals are diamonds.
All salts can form crystals.
Not all of them. Volcanic glass does not have crystals.
No, they do not have bands of crystals but they are all crystalline.
All salts make crystals.
Highly variable. Are you talking crystals, or massive material for carving? It's a common mineral, seldom too valuable, though undamaged and colorful crystals can be worth hundreds.
Crystals are found in all countries.
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.
Yes, face-centered cubic crystals.