ETYM Greek, tin.
Or tinstone; Chief ore of tin, consisting of reddish brown to black stannic oxide (SnO2), usually found in granite rocks. When fresh it has a bright (“adamantine”) luster. It was formerly extensively mined in Cornwall, England; today Malaysia is the world’s main supplier. Other sources of cassiterite are Africa, Indonesia, and South America.
A hard heavy dark mineral that is the chief source of tin.
Native dioxide of tin, the chief ore of tin.