Banded-iron formation from the Mesabi Iron Range, Minnesota, USA:
Size: 7 cm

Banded-iron formation from Negaunee Iron Mine, Michigan, USA:
Size: 20 cm

Banded-iron formation from Port Handford, Western Australia

Archean Banded-iron formation from the Gongchangling Mine:
From: Anshan, Liaoning Province, China
Size: 32cm