Pebbles are particles with a particle size greater than 5mm formed under natural conditions of rocks. Pebbles took a long time to form. The formation process of pebbles can be divided into two stages: the first stage is the stage of rock weathering and collapse; The second stage is the stage when rocks are carried and bypassed by rivers.
The main producing areas of rain flower stones in China come from Nanjing and Jiangsu, and the middle and lower reaches of the Yangtze River are rich in resources, mostly in sedimentary form.
In addition, there are abundant pebble resources in other areas, including Shandong and Liaoning in the north and Guizhou, Chongqing and Guangxi in the south. Pebble resources have their own characteristics and are rich in species. Among them, due to historical reasons, the pebble resources in Guizhou and Guangxi are well preserved and rich in species.
There are many large pebbles in southwest China, which are large in size and strange in shape, and are especially suitable for being used as geomantic stones or cultural stones in landmark buildings.
Pebbles are by-products of yellow sand mining, so they are named after being shaped like goose eggs. As a kind of pure natural stone, pebbles are taken from the gravel mountain produced by the uplift of the ancient river bed after the crustal movement thousands of years ago, and they are constantly squeezed and rubbed during the transportation of mountain torrents and running water.
In the course of tens of thousands of years, pebbles have experienced the movement of waves and water, lost their irregular edges and corners by the collision and friction of gravel, and been buried underground with sediment for millions of years.