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The main component of limestone ore is carbon calcium CaCO3. Limestone is a kind of rock with a single calcite mineral component. The calcite component accounts for 95%. The other small amount of minerals it contains include dolomite, siderite, quartz, feldspar, mica, as well as the Kyrgyz clay mineral which can reflect the stone color. The pure limestone is white. Limonite and siderite make limestone produce yellow brown patterns and colors, such as blood red, sea green, sub * * salt green, asphalt gray to black. Limestone produced in seawater is composed of bone fragments of animals and plants, physical changes of calcareous mud and organic matters in seawater. After these organic compounds are dissolved in the sea water, they accumulate on the sea floor, and gradually form carbon calcium and shell texture. Generally, after limestone is cut, it will be found that there are intact or damaged biological fossils inside the stone.