There are many places in Crystal Stone, such as Humble Administrator's Garden, Dachengfang, Confucian Temple, Guanqian Jade Store, Tang Wei Jewelry City and Guangfu Jade Street. The chemical composition of crystal is silicon dioxide, the purer one is called crystal, and the more impurities are called Yingshi (the raw material for making glass), which is distributed all over the world (even in Tianpingshan, Suzhou, where I went to collect specimens in high school). Only Brazil, Lianyungang and other places are rich in reserves and become the main distribution centers. It is natural to be cheaper by tens of dollars, and of course there are tens of thousands. To put it bluntly, it is stone. Some varieties like it are more expensive and some are rare, such as some crystals with other minerals, or crystals with inclusions, very pure crystals and so on. And some varieties like it more or less, such as colorless and translucent crystals and crystals with more impurity black spots.