Last Updated:2025/12/02

The geologist carefully examined the ceylonite under the microscope to determine its manganese-to-iron ratio.

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The geologist carefully examined the ceylonite under the microscope to determine its manganese-to-iron ratio.

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地質学者は顕微鏡でそのフェロアン・スピネル(マンガン対鉄比が3:1から1:1で、三価鉄がほとんど含まれない鉱物)を慎重に調べて、マンガンと鉄の比率を測定した。

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