noun🔗ShareColemanitA white, grey or colorless mineral form of calcium borate; a principal source of boron."Geologists studying borate deposits found large amounts of colemanite, a mineral crucial for boron extraction. "Geologen, die Boratvorkommen untersuchten, fanden große Mengen an Colemanit, einem Mineral, das für die Borongewinnung entscheidend ist.mineralgeologymaterialsubstancechemistryscienceChat with AIVocabulary GamePractice Reading