Amethyst, from Greek, means "unbreakable". Its chemical composition is silicon dioxide, which is a ternary system. The crystal is a hexagonal column with horizontal stripes on the left and right sides of the cylindrical surface. Twins are very common. Hardness 7, the crystal often contains irregular or feathery gas-liquid inclusions, which is the most expensive member of the crystal family. Because the crystal contains Mn and Fe3+, it is purple and transparent, and it has obvious polychromatic color under the dichroic mirror. Amethyst from Uruguay has always been the highest hue of purple in amethyst. This kind of purple is very deep and delicate, with a kind of Burgundy "fire", which is a necessary commodity for high-end jewelry stores all over the world.

Strawberry crystal is the common name of strawberry crystal, because its appearance is more like the color of strawberry, and the natural precipitation inside is like the seeds on strawberry. It is a ghost crystal, white crystal wrapped in iron ore, hence the name strawberry crystal.