noun🔗Share피치스톤A natural glass, rich in microscopic crystallites, formed by the rapid cooling of lava or magma"The sharp edges of the pitchstone found near the volcano were used by early humans to make tools. "화산 근처에서 발견된 피치스톤의 날카로운 모서리는 초기 인류가 도구를 만드는 데 사용했습니다.geologymaterialChat with AIVocabulary GamePractice Reading
