流りゅう紋もん岩がん

noun

rhyolite

A fine-grained volcanic rock, often with flow banding; the Japanese name literally means 'flow-pattern rock'.

• 流りゅう紋もん岩がんは火か山ざん岩がんの一いっ種しゅで、石せき英えいや長ちょう石せきを多おおく含ふくむ。

  Rhyolite is a type of volcanic rock that contains a lot of quartz and feldspar.