A columnar crystal stone with little purity. Crystal stone is a kind of gemstone. It belongs to quartz crystal and belongs to the quartz family in mineralogy. The main chemical component is silica, which forms colorless and transparent crystals when pure. There are more than ten names of crystals in ancient China, such as water essence, water green, water jade, crystal stone, etc. Well-developed single crystals are hexagonal pyramids, so they are usually lumpy or granular aggregates, usually colorless, gray, or milky white. , when containing other mineral elements, it appears purple, red, smoke, tea, etc.