What is the difference between Yuhua stone and Dandong cobblestone

the difference:

Yuhua stone is a precious gemstone formed by a mixture of quartz, chalcedony and flint or opal, also known as Yuhua agate. According to legend, in the Liang Dynasty, one thousand and four hundred years ago, a Master Yunguang lectured in the southern suburbs of Nanjing. He was touched by the sky. The lecture hall was renamed Yuhuatai. The idiom "the sky is falling in disorder" comes from this legend.

The formation of Yuhua Stone has gone through three complicated and long stages of primary formation, secondary transportation and sedimentation of gravel layers. Yuhua stone is a kind of natural flower agate, mainly produced in Liuhe District, Nanjing City, Jiangsu Province. It is the country's Yuhua stone producing area. The surface is smooth, the texture is hard, and the color is bright; the main colors are red, white, yellow, black and multicolored, which are of ornamental value. The composition of Yuhua Stone is mainly silica, and the red components are iron and ferrous ions.

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Dandong pebbles are by-products of yellow sand mining. They are named because they resemble pebbles. As a kind of pure natural stone, cobblestone is taken from the sand and gravel hills produced by the uplift of the ancient riverbed after the crustal movement thousands of years ago. It has experienced the impact of mountain torrents and the constant squeezing and friction during the process of moving water.

In the course of tens of thousands of years of vicissitudes and vicissitudes of life, the pebbles have gone through the waves and water, lost their irregular edges and corners by the collision and friction of the gravel, and have been buried deeply in the ground together with the sand for millions of years.

Dandong pebbles are sandstone hills produced by the uplift of the ancient riverbed after the crustal movement tens of thousands of years ago. They have experienced the impact of mountain torrents and continuous squeezing and friction during the process of moving water. In the process of tens of thousands of years of vicissitudes and vicissitudes of life, they have experienced waves and water, lost their irregular edges and corners by the collision and friction of gravels, and were buried deep in the ground together with mud and silent for millions of years. The main colors of pebbles are black, white, yellow, red, dark green, blue and gray. The chemical composition is silicon dioxide, followed by a small amount of iron oxide and trace elements and compounds such as manganese, copper, aluminum, and magnesium.