Tesaurus d'Art i Arquitectura Getty Institute 0000-00-00 2024-01-24 15:40:44 en cassiterite300264236 A heavy, metallic, hard tin dioxide, chemical formula SnO2, that is the major ore of tin. It is colorless when pure, but brown or black when iron impurities are present. Commercially important quantities occur in placer deposits, but cassiterite also occurs in granite and pegmatites. casiterita cassiterita 2026-03-30 20:32:55