Solid minerals called Semi Stone Crystals are composed of atoms arranged in three dimensions of space in a highly organized, repeating pattern. The different forms and physical characteristics of crystals are explained by their well-organized structure. Numerous processes, including the cooling of molten lava, evaporation of water, and precipitation from a solution, can result in the formation of crystals.
Examples of crystal types found in minerals are amethyst, calcite, and quartz.
Gemstones: These are polished, treated minerals, such as sapphires, emeralds, and diamonds, that are used in jewelry.