This is a photo of aluminium hydroxide nodules. These mineral formations have concentrated and solidified around sand grain nuclei within the rock, resulting in the brown surface with numerous cracks and depressions. The interplay of light and shadow crea
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Japanese version: 水酸化アルミニュームのノジュール（砂粒等を核として岩石中の水酸化アルミニュームが濃縮、沈殿しかたまったもの）
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