noun🔗Share珪岩A metamorphic rock consisting of interlocking grains of quartz."The hiking trail was made of crushed quartzite, which sparkled in the sunlight. "ハイキングコースは砕かれた珪岩でできており、日光の中でキラキラと輝いていた。geologymaterialChat with AIVocabulary GamePractice Reading
