noun🔗SharePechsteinA 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. "Die scharfen Kanten des in der Nähe des Vulkans gefundenen Pechsteins wurden von frühen Menschen zur Herstellung von Werkzeugen verwendet.geologymaterialChat with AIVocabulary GamePractice Reading
