Volcanic block

Japanese: 火山岩塊 - かざんがんかい(英語表記)volcanic block
Volcanic block
Volcanic bombs that are expelled from the crater, land and solidify are called volcanic boulders when they are mainly angular in shape, and are thought to have been expelled from the volcano in a solid state.

Source: Asakura Publishing Dictionary of Petrology Information

Japanese:
火口から放出され着地し固化した火山弾(volcanic bomb)が,角張った形状のものが主である場合に火山岩塊といい,これは固体の状態で火山から放出されたと考えられる.

出典 朝倉書店岩石学辞典について 情報

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