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lava rock
It was generally accepted that volcanic rocks with such high levels of magnesium could not exist.
The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock.

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Open the tool →火山岩 (huǒ shān yán) means “volcanic rock, lava rock”.
火山岩 is pronounced huǒ shān yán in Mandarin Chinese.
“volcanic rock” is 火山岩 (huǒ shān yán) in Chinese.
This page has 2 example sentences using 火山岩, each with pinyin and an English translation.