A solid into a solid. A solid into a liquid, and a liquid into a liquid. All of these are solutions. Crystals can form from vapors, solutions, or molten materials. No one knows how the crystals can come together and make the formation.
Crystals grow from the outside, unlike that of a human being.
Particles are attracted to the seed of the formation and then build on up in an orderly pattern. Time and freedom are needed for the molecules to make perfect crystals. Crystals can form from a solid, liquid, or gas. Crystallographers are the people who study crystals. When scientists began asking many new questions about everything around them in the seventeenth century, the crystal meaning included many other materials than rock quartz and ice.