Ziyun stone was formed in the Sinian 600 million years ago. The geological name is “microcrystalline limestone”. It is a fine-grained limestone of sedimentary genesis. It is composed of calcite, quartz, clay and a small amount of elements such as barium, boron and phosphorus. The hardness is 5- Level 6 is attached to the formation of the Nanfen Formation and produces a complex shallow marine deposit.

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