A.1150-1250 B.1200-1280 C.1250-1300 D.1300-1350
A.1150-1250 B.1250-1400 C.1350-1450 D.1300-1500
A.磁鐵礦 B.玻璃體 C.鈣鐵橄欖石 D.鐵橄欖石