Quartz crystal
Synthetic bismuth hopper crystal
Insulin crystals
Gallium, a metal that easily forms large single crystals
A large monocrystal of potassium dihydrogen phosphate grown from solution by Saint-Gobain for the megajoule laser of CEA.In chemistry, mineralogy, and materials science, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions.
The word crystal originates from the Greek word κρύσταλλος (krystallos) meaning clear ice, as it was thought to be an especially solid form of water.[citation needed] The word once referred particularly to quartz, or "rock crystal".
Most metals encountered in everyday life are polycrystals.[citation needed] Crystals are often symmetrically intergrown to form crystal twins.
Credit : en.wikipedia.org
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