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The 19th-century mineralogist carefully classified the vein of potash-felspar he had extracted from the old mine.
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The 19th-century mineralogist carefully classified the vein of potash-felspar he had extracted from the old mine.
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19世紀の鉱物学者は、古い鉱山から採取したカリ長石の脈を注意深く分類した。
