black,yellow,red,white,multicolored river stones with high polishing.
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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The keel stone is an animal fossil. The cause is that after the animal is buried in the soil, the organic matter in the bone...
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Melaleuca stone: hard and dense, with a thin weathered layer on the outside, relatively soft; the texture on the stone is...
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Wood fossils are tree fossils in which the wood parts are exchanged with SiO2 (silica) in groundwater after the trees have...
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The main chemical components are silicon dioxide, followed by a small amount of iron oxide and trace elements such as...
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