noun🔗ShareEstibnitaA grey mineral, Sb2S3, that is the main ore of antimony; used in ancient times as the cosmetic kohl."The ancient Egyptians used ground stibnite as kohl eyeliner to darken their eyelids. "Los antiguos egipcios usaban estibnita molida como delineador de ojos de kohl para oscurecer sus párpados.mineralgeologysubstancechemistrymaterialChat with AIVocabulary GamePractice Reading