Its formation is generally considered to be a calcium material precipitated from carbonated spring water (usually a hot spring) under atmospheric conditions. The specific formation is that the circulating groundwater containing oxidized carbon carries a large amount of calcium carbonate in the solution of the plant. When the groundwater reaches the surface of the spring, some carbon dioxide is released and condensed in the sediment layer of the calcium carbonate to form A rare bubble (hole), which has a travertine. Unlike limestone sediments in the ocean, most of the tuffs are deposited quickly in rivers or lakes and ponds. This rapid deposition prevents the release of organic matter and gases, resulting in beautiful textures, but it is also disadvantageous. The delamination of the internal crack is created, causing it to weaken in intensity consistent with the direction of the texture. Because there are holes in the tuff, its unit density is not large, it is suitable for covering materials, and it is not suitable for the structural materials and basic materials of the building. In the past, human clay used a lot of travertine as the basic material and structural material of the building, but with concrete, it is not used much now. In addition to yellow, travertine has green, white, purple, pink, brown and so on. There are also travertine discoveries and outputs in Henan, China. Check Valve,Swing Check Valve,Backwater Valve,Double Check Valve Zhejiang minmetals huitong import and export Co., Ltd , https://www.zjminmetals.com