This kind of stone is commonly found in many rivers in Yunguichuan, especially in mountainous areas. There are also many Gobi deserts in Gansu and Shaanxi. Considering that you are going to travel, let me talk about some of my experiences. When I went to Dunhuang last year, I picked up a lot of stones in the river next to the West Thousand Buddha Cave. Many of them were sold in Dunhuang, and the smaller ones could be made into bracelets. There are also many Lijiang rivers in Guilin, Guangxi, especially Xingping, which is also the place where 20 yuan's commemorative photos were taken. There is also a stream next to Miao village in southeastern Guizhou. Attached are two pictures that I said. In fact, they are easy to find in ordinary rivers. It is not easy to fight by hand, but I still hope to adopt.