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This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.

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Open the tool →稀有金属 (xī yǒu jīn shǔ) means “rare metal”.
稀有金属 is pronounced xī yǒu jīn shǔ in Mandarin Chinese.
“rare metal” is 稀有金属 (xī yǒu jīn shǔ) in Chinese.
This page has 2 example sentences using 稀有金属, each with pinyin and an English translation.